Millwright Level 3 Practice Test

These questions are part of the practice quiz. Start practicing

• What factor does NOT affect hydraulic system efficiency?
• What type of accumulator operates at a constant pressure regardless of the system pressure?
• Which benefit do multi-stage barrel pumps provide?
• If you cannot rotate the rotor of a gear motor by hand, what does this indicate?
• What happens to the velocity and pressure of air as it flows through a dynamic compressor?
• What feature does a sequence valve have related to its drainage?
• To eliminate air pockets and voids under the base, which method is used?
• What is necessary for all fans to help stop arching through the bearings?
• What is the maximum line pressure in a system with a 35 hp motor, a 20 gpm pump, a cylinder diameter of 3 inches, and a safety factor of 6?
• If force = pressure x area, then area = _____________
• When A dial is zeroed at the 3 o'clock position, a positive reading when measuring horizontal moves would require moving the machine to the __________ when looking at the equipment from the fixed machine to the MTBS.
• What is the result of an excessive suction lift?
• Which configuration would typically yield the highest efficiency for a screw compressor?
• What can cause increased vibration in a positive displacement pump?
• What is the function of a relief valve in a pumping system?
• What is a benefit of using synthetic hydraulic fluids compared to conventional oils?
• How much is 1 horsepower equivalent to in terms of GPM and psi?
• What supports the pleated fiberglass filter?
• Which of the following statements is true about hydraulic pumps?
• Why are vibration isolators used in fan systems?
• What is a common issue that can result from a misalignment of machinery?
• When should dynamic pump wear rings be replaced?
• Pressure override is the difference between which two types of pressure?
• Which metals can corrode iron and steel according to the galvanic series?
• Using the combined gas law, what would be the final pressure in psig with given conditions?
• What component can help avoid pressure build-up in a hydraulic system?
• If the dial reading for shaft misalignment is + .014", what is the actual total (rim) misalignment present?
• What is the purpose of a stop tube in a cylinder?
• Which of the following describes a high altitude compressor's performance?
• When tightening flared fittings, how much should they be tightened after achieving hand tight?
• What is the cutting speed in FPM for a high-speed steel drill of 5/16" diameter drilling into a 2" thick block of stainless steel?
• What is the purpose of oil in flooded screw compressors?
• What type of fan blade is ideal for high-pressure applications that face wear and imbalance issues?
• Cross-port relief or cushion valves provide assistance in hydraulic systems by mitigating what?
• What causes turbulent flow in a hydraulic conductor?
• When should vegetable oils such as soy oil be utilized?
• Where would be the best location for a pressure relief valve in a hydraulic circuit?
• Which of the following is a common method used to check machine alignment?
• How much concrete should be ordered for a machine base that is 8 inches thick, 12 feet long, and 8 feet wide?
• What impact does increasing carbon content have on steel?
• What is the output speed of a gear train with an input speed of 600 rpm, given the teeth configuration?
• Which one of the following symbols represents a gas charged accumulator?
• When using a pump graph, if you find that the impeller that is needed is about 10% smaller than the one you have, what options do you have to maintain the same steady volume of flow and head?
• To adjust the output flow of an axial piston pump, what must you change?
• Which formula is used to determine pressure in a hydraulic system?
• What does an increase of intake velocity cause in a pump system?
• Which of the following valves is used for changing the flow direction in a hydraulic system?
• Does the location of the discharge port affect the pressure ratio of the screw compressor?
• What instrument has the ability to measure angles down to minutes or even seconds, depending on the accuracy of the instrument?
• What happens to hydraulic systems when water enters the hydraulic oil?
• Which pump features a cam inserted between the discharge and inlet ports?
• Is it true that CWP is a steam pressure valve?
• Plastic shims are color coded for thickness, whereas metal shims are classed by?
• What is the role of compressors in the oil and gas industry?
• Pressure override is equal to:
• In a hydraulic system, what does a decrease in fluid temperature typically affect?
• A pump is rated at 400 psi. It is working against a 100 ft head of water. What is the available pressure after the loss from the 100 ft of head?
• Convert 40 ft of oil with a specific gravity of 0.8 to the equivalent ft of water.
• What should be checked when troubleshooting hydraulic systems?
• What are the possible area ratios in the seating area of slip-in cartridge valves?
• What source of energy allows liquid to enter a pump with suction lift?
• Which type of blower is noted for having higher efficiency?
• What control device is the most effective for reducing sulphur dioxide pollution?
• What is the primary purpose of a pump system in an industrial setting?
• How does air-flow occur in a liquid ring compressor?
• What is NOT a consideration when choosing a coupling alignment procedure?
• What type of bronze presents the biggest health hazard?
• The cross dial A reads off of the __________.
• What type of pressure control maintains reduced pressures in certain portions of the system?
• What happens to the oxidation rate of mineral oil for every 18 degrees F increase above 135 degrees F?
• What type of fan is designed to pull hot combustion gases out of a boiler?
• What is a significant advantage of laser alignment compared to wire alignment?
• To maintain the efficiency of a compressor, the ambient conditions should?
• The X value in the cross dial formula measures the distance between coupling halves. Is this statement true or false?
• What could cause low output speed of an actuator?
• Fans or blowers that create a swirling helical flow pattern are known as what type of flow?
• Which type of quenching medium provides the fastest cooling rates?
• What does a float center in a directional control valve allow?
• The efficiency of pollution control can be greatly enhanced through which of the following methods?
• How can cavitation, indicated by a rattling noise, be checked?
• What is the purpose of a millwright racking out a breaker within the local M.C.C. before performing an alignment?
• Which misalignment condition should be corrected first?
• What contributes to reduced efficiency in hydraulic circuits?
• What type of misalignment do dial indicator readings taken on the face of the coupling indicate when rotated through 180 degrees?
• Why is checking the alignment of a pump important after installation?
• Which device is used to help direct airflow in screw compressors?
• Determine the maximum load that can be moved with a relief valve setting of 1500 psi and a cylinder with a 3 inch bore.
• The dowel diameter for indirect drive equipment should be what in relation to the hold down bolts?
• What type of impeller aids in pushing liquid to the pump inlet?
• Using level indicators and automatic shut-offs helps to control what in hydraulic systems?
• For a hydraulic fluid to function properly over acceptable periods of time, it must?
• To install anchor bolts before pouring the concrete foundation, what is needed to properly position the machine?
• An easy way to transfer oil to a hydraulic system is through?
• How should hydraulic lines be maintained for optimal performance?
• What can misaligned couplings lead to?
• How can wear rings last longer?
• The pressure in the atmosphere which is always available to aid in pump delivery is rated at?
• When pressure is constant in a hydraulic system, which piston exerts greater force?
• Reflecting on Bernoulli's Principle, what happens to the pressure in a hydraulic system when the fluid flow is increased?
• When troubleshooting electro-hydraulics with a servo valve, what type of system is it likely to be?
• Based on given specifications, what is the effort needed if diameter d is 0.554 inches, diameter D is 3.25 inches, load L is 3050 lbs, and LD is 0.255?
• According to Gay-Lussac's law, what is considered a constant?
• What device is used to measure hydraulic pressure in a system?
• What must be done to the prime mover hold down bolts before taking readings with a dial indicator?
• What is the effect of using an inlet bell with internal guide vanes on a centrifugal fan?
• For every 150 degrees F change in temperature, how much does steel length change per inch of material diameter?
• Cyclones are less efficient when the dust density is:
• Which valve is specifically designed to maintain a predetermined minimum pressure in a hydraulic system?
• Which mechanical property is essential for materials used in cutting tools?
• What element in a pump system helps ensure fluid does not leak when under pressure?
• When there is constant flow in a pipe, what happens to the velocity of gas when the pipe size increases?
• What is the desired orientation of the target sensor during laser bore alignment?
• Invisible leaks in hydraulic cylinders occur where?
• What happens to a liquid passing through a restrictive orifice?
• What materials can open wheel radial blades in a fan handle?
• Which method is used to maintain acceptable temperature levels of hydraulic fluid?
• When repacking the packing gland of a compressor, at what angle should the joints be staggered?
• How should thermal expansion be considered in shaft alignment?
• What happens to screw-in cartridge valves if they wear out?
• In machine installation, which component is primarily used to secure units to the foundation?
• What piece of equipment forces air through a smaller outlet for increased air velocity?
• How would you verify if the system is functioning properly in a closed loop?
• How many shims should be kept to a minimum when adding under the machine's foot?
• What type of wear pattern is associated with contamination in vane pumps and what is the effect of cavitation?
• What is the purpose of storing hydraulic fluids appropriately?
• Which type of hydraulic pump is known for having both increasing inlet and decreasing outlet chambers?
• If attachments to machine units cause misalignment from the specified tolerances, the attachments should be:
• What might happen if laser equipment is not calibrated properly?
• Bar sag is ________ to the reading on dial B.
• When a material is deformed beyond its elastic limit, it undergoes:
• Are unloading valves used in accumulator circuits to relieve all the pressure?
• Why are O-ring boss ports and connections considered the best?
• What condition justifies intentionally misaligning machines?
• Is it true that a broken spring is a common problem with a relief valve?
• In a hydraulic circuit, which piston will move first if one is 4" and the other is 8" in diameter, with respective loads of 20,000 lbs. and 40,000 lbs.?
• Lapping mating surfaces on valves results in what benefit?
• Which of the following is the primary purpose of scrubbers in pollution control?
• Which type of check valve is most appropriate for handling liquids containing solids?
• What type of circuit will provide a faster piston extension and exert less force than a regular circuit?
• When repacking the bearings of a liquid ring compressor, what is the recommended amount of grease to fill the housing?
• What must you do when locking out machinery that is to be aligned?
• The viscosity of a fluid is a measure of its?
• When you heat a gas in a confined space, the pressure will go?
• What type of filter should never be used in a hydraulic system?
• The foundation should be set low by what distance to allow grouting of the machine base?
• What is the primary concern when using the least number of shims to achieve correct stack thickness?
• Ductility is defined as the ability of a metal to do which of the following?
• Batteries produce electrical current through which of the following processes?
• Are all lasers used for alignment classified as Class 2 lasers?
• To effectively troubleshoot a hydraulic system, what must one understand?
• If a compressor is working at a high altitude compared to one at low altitude, it will produce?
• The function of this valve is to slow down piston speed to perform a second function during piston travel:
• What do rotary screw compressors primarily deliver?
• Is a double acting cylinder with two rod ends performing equal work in both directions?
• Which component is critical for measuring the accuracy of machine alignment?
• On a V-belt drive with a 180-degree arc of contact on an 8" diameter driver pulley, what is the length of the belt in contact?
• In fan discharge piping, what is necessary to improve air flow quality?
• What is the force in pounds exerted by a pressure of 1000 psi on a piston with a diameter of 3"?
• What should be verified when maintaining lobe blowers?
• What is the value of the information collected when you perform a hot alignment check?
• What can be used to help stop the rotors from contacting each other in multiple screw pumps?
• What do check valves prevent in a hydraulic system?
• How is the filtration area of paper filter mediums primarily increased?
• How do diffuser rings impact the functioning of centrifugal fans?
• Which aspect of a hydraulic system can be affected by the choice of pipe materials?
• What does the pump in a hydraulic system produce?
• If you were checking for flow over a relief valve, which instrument would you use?
• Inducers in pumps typically provide which type of flow?
• Hydraulic oils used for low temperature applications should have a low?
• When beginning the alignment, what is the first step you should take?
• What is a primary cause of serious eye injury from lasers?
• Which reciprocating pump type can safely run dry without damage?
• What is the term for the pressure at which a pressure relief valve starts to open?
• What is a common consequence of incorrect timing in hydraulic motors?
• Directional control valves are identified by the number of what component?
• Which mounting method is designed to permit machine repositioning while maintaining alignment?
• Which statement correctly describes the nature of flow in a right angle check valve?
• What is a common fault that can cause servo valve systems to become inoperable?
• When air is forced through a duct system, which pressure is likely to decrease?
• Which type of alignment check is generally considered unreliable and infrequently used?
• Which of the following is NOT a stage of water treatment?
• When using a dial indicator for alignment, what is a key factor to check?
• Compressor unloading can involve which of the following methods?
• When using laser alignment equipment, where should the transmitter be mounted?
• If a counterbalance valve has its load falling uncontrollably, what should you do to fix it?
• Most prime movers require careful coupling alignment at or above what SFM?
• What setup is needed to read all fan pressures accurately?
• Which of the following statements about dither is true?
• How often should a machine's alignment be checked after initial setup?
• What contributes to reduced efficiency in equipment designed to remove airborne particulates?
• What is one of the main advantages of alternating current electricity?
• What might indicate a malfunctioning hydraulic pump?
• The coefficient of linear expansion for carbon steel is ________________ F?
• Newton's 1st law states that:
• What kind of sound can indicate an issue with fan bearings?
• Do large butterfly valves use a power actuator to rotate the disc?
• Hydraulic fluids should generally have what characteristic to ensure efficiency?
• What is the most efficient approach to pollution control?
• What is the volume required for a hydraulic cylinder that has an area of 12 sq. inches and is to move 3 ft. in 8 seconds?
• What type of contamination comes into the hydraulic system from the outside?
• In a volute pump, the impeller can be reduced by __________% before hydraulic losses affect pump efficiency.
• In a given alignment setup with X=10", L1=20", L2=40", A dial = -2, and B dial = -21, what are the horizontal moves?
• If the base plate surface is not level, what should you check for?
• How much internal leakage might hydraulic pumps have between sealing components?
• What is a potential consequence of recirculation of fluid in a pump?
• What is typically used to assist in leveling machinery during installation?
• What type of pump is characterized by having an eccentric rotor?
• What may cause an increase in pump motor power consumption?
• Why is proper maintenance of the screw intake air filter important?
• Why are petroleum-based hydraulic fluids used most frequently?
• What methods can cooling towers utilize for air flow?
• The ability of a material to return to its original dimensions after being acted upon by a force is called:
• What does Charles' law consider as a constant?
• A normally open pressure reducing valve is designed to do what?
• What will happen to the speed and torque of an in-line axial piston motor if the swash plate is set nearly straight up and down?
• What is one key application of a flow control valve?
• When encountering misalignment issues, what is the preferred method for correction?
• When using anchor bolts with deformed ends, what is the required length of the bent leg?
• Which one of the following symbols represents a pressure switch?
• What occurs if the preload spring is improperly handled during maintenance?
• Reservoirs that are vented use which method to help push oil into the pump?
• When checking hydraulic fluid conditions, what instrumentation is best for assessing cleanliness?
• A hydraulic motor with a broken shaft may suffer from which of the following issues?
• If a pump is rated at 50 GPM but only produces 30 GPM, what is the volumetric efficiency?
• What type of pressure does a centrifugal fan primarily convert velocity pressure into?
• How should bleed ports in cylinders be oriented when the cylinder is mounted vertically?
• What is the primary function of a pump in hydraulics?
• What is one characteristic of positive displacement pumps?
• What would the required impeller diameter be if needed in the system?
• Which condition often indicates a misaligned machine?
• Dilution of pump fluids can lead to which issue?
• How many watts are there in 1 horsepower (hp)?
• What type of pressure does a manometer measure in relation to a fan?
• Dial bar sag can occur with which of the following conditions?
• Various methods are employed to mount and secure machines in place. What must the method used accomplish?
• What is the circular collection chamber surrounding the fan wheel of a centrifugal fan called?
• As pressure increases, what happens to the boiling point of a liquid?
• When dealing with thermal growth, how should machinery be aligned?
• The inlet filter in a hydraulic system should be about _____________ and have a _____________ for safety.
• Particle counters measure particles at what micron ratings?
• The pressure at which a check valve will start to open is known as?
• What can excessive tightening of flared fittings lead to?
• What is the relationship between teeth count and rotational speed in meshed gears?
• Brake valves are used on the discharge of hydraulic motors to:
• What pressure is required in a hydraulic system to cut ¼" stainless steel with a shear strength of 50,000 psi using a 4" diameter piston?
• In hydraulic systems, what is the relationship between force and area?
• What does gauge pressure take into account?
• Which type of fan blade design shows the greatest efficiency?
• What type of control valve is typically used for directing flow in hydraulic systems?
• When removing the spool on a radial piston motor, why is it essential to mark its position with respect to the housing?
• What diagnostic step should be taken if a hydraulic actuator is moving slower than expected?
• What is the pressure created by a column of water 30 ft high?
• What is the primary factor affecting the force exerted by a piston in a hydraulic system?
• What happens if the RPM of the electric motor in a fixed displacement pump is changed?
• If 500 psi is applied to the low-pressure side of an intensifier cylinder with an input area of 10 sq in, what is the force in pounds?
• If an 8-foot long machine base is to be poured with concrete that is 8 inches thick, how many cubic feet of concrete is required?
• What is the unit of metric measurement for work?
• To create flow in a compressed air system, what is required?
• What tool is commonly used to measure the diameter of a pipe?
• When taking four readings around 360 degrees, the vertical readings should equal which of the following?
• If a roller chain has a 16 tooth driver sprocket and a 24 tooth driven sprocket, how many links of #45 chain are needed for a 24" distance?
• What would excessive pressure in a hydraulic system be caused by?
• If there is acid effluent in water treatment, what must be done?
• Which type of cartridge valves generally has a simpler design?
• What type of hydraulic system component is designed to regulate and maintain fluid flow under specific conditions?
• When assessing flow rate through a filter, what does a smaller micron rating signify?
• Which type of valve typically requires a higher degree of filtration?
• What could low pressure in a hydraulic system indicate?
• On a vertical plunger pump, where is the plunger attached?
• How is displacement inside a hydraulic motor measured?
• What primary function does a hydraulic accumulator serve?
• What is the role of an electrostatic precipitator?
• The heat from a hydraulic line would indicate a sign of what kind of issue?
• A pressure reducing valve is commonly used to maintain what in a hydraulic system?
• After alignment and leveling of equipment, you should torque hold down bolts to what percentage before grouting?
• Which of the following best describes the function of an impeller in a pump?
• What is the main function of an accumulator?
• What should be done when installing new equipment to be cross dial aligned?
• Which component is primarily responsible for creating a vacuum in a diaphragm pump?
• What is a common symptom of a clogged air/oil separator in a compressor?
• What component helps to locate, set, and hold anchor bolts in place while cement cures?
• Which method is used to check alignment according to the principles of laser technology?
• What is the pressure condition throughout a hydraulic system when all factors are constant?
• What defines a perfect vacuum?
• Which casing style is typically used for high pressure in centrifugal compressors?
• What does the hardness of a metal measure?
• Must the fixed bearing in a screw compressor be located at the intake end?
• What is crucial when torquing bolts on equipment?
• Which practice should be avoided when aligning machinery?
• When aligning an electric motor to a hydraulic pump, why should the system be bled off and isolated?
• Which impeller type has the lowest specific speed?
• A base plate is used when there is a driver and driven unit of machines.
• What is the least efficient method of controlling fan output?
• What type of system uses LVDT's to sense the spool position?
• Limited rotation motors have what type of number of shaft rotations?
• What is the result of converting 180 degrees Fahrenheit to degrees Celsius?
• Which number corresponds to the regular pipe schedule standard?
• What factor does the temperature compensator in a flow control valve primarily help maintain?
• How many teeth must the larger gear have if the smaller gear has 50 teeth and they turn at 250 and 300 rpm respectively?
• Which statement is true regarding the functionality of a tachometer in troubleshooting?
• How can hydraulic shock be absorbed in a system circuit?
• A small vane called the intra-vane is used in conjunction with external holes to control what aspect of the pump?
• A double acting cylinder can be controlled by which type of valve?
• Which tool is used to measure pump shaft runout?
• In a vented relief valve, the pilot stage is drained externally at a pressure:
• What does laminar flow in a hydraulic system help to accomplish?
• How are pressure gauges protected from pressure spikes?
• What method is used to determine shim needs in alignment?
• What is a consequence of misalignment in rotating machinery?
• What issue can occur in an axial piston pump with variable displacement if the flow or pressure is low?
• When are meter-in flow controls not typically used?
• What component in a dry dynamic precipitator is the particle laden gas stream driven against before being deposited into a hopper?
• When first moving the machine for alignment, what is the recommended action?
• Where should a filter be located in hydraulic systems?
• What is a regenerative center in a directional control valve primarily used for?
• Vane compressors operate based on which principle?
• What pressures should be monitored when troubleshooting a pump cavitation issue?
• How do check valves prevent reverse flow?
• When troubleshooting a hydraulic system, which issue would not typically result in a slow actuator acting against the full force of the system?
• What advantage does forced draft provide in a furnace?
• Can an AC solenoid experience burn out and produce noise?
• If you have a flow rate of 2 GPM and a cylinder with a capacity of 1 gallon, how long would it take the cylinder to extend fully?
• Which suction piping condition should be avoided?
• When you can't use dials to measure misalignment, can you use the cross dial formula with feeler gauges or calipers?
• A 16.38 lobe blower size indicates what?
• Positive displacement compressors operate under the principle that:
• Why are synthetic oils increasingly used in hydraulic systems?
• Which type of valve allows for multiple machine operations sequentially and is commonly used in hydraulic systems?
• What must be maintained inside a lobe blower to ensure proper clearance in the unit?
• Is the statement "Distance = time/velocity" true or false?
• What does the beta ratio measure?
• What is the function of springs in hydraulic vane motors?
• What is a common application of ultraviolet light in water treatment?
• What is the most effective way to test a directional control valve for proper actuation?
• According to Boyle's law, what is considered as a constant?
• What would be the rpm of a rear wheel sprocket with 15 teeth if the pedals with a 48-tooth sprocket are turning at 150 rpm?
• What is the force in newtons when converting 1 kg mass that accelerates at 9.8 m/s²?
• Erratic pressure could be caused by which of the following?
• Given an 8" diameter driver sheave, a 12" diameter driven sheave, and a center to center distance of 36", what is the precise length of the belt?
• What equipment removes particulates from air using inertial, centrifugal forces, and gravity?
• What component is used to squeeze the flexible tube in a flexible tube pump?
• An 8" diameter pulley revolving at 120 rpm drives a pulley which must rotate at 150 rpm. What diameter is the second pulley?
• The term "delta" in the formula for change in length refers to:
• Do balance valves require less force to open compared to conventional globe valves?
• Why is a butterfly valve preferred in high-pressure applications?
• How do you convert 250 degrees Fahrenheit to absolute degrees Kelvin?
• Uneven wear patterns on mechanical seal faces may indicate?
• If you have a pressure reading of 30 psi absolute, what would it be in gauge pressure at sea level?
• What condition must the surface be in before applying grout to a concrete slab?
• When repacking valve stuffing boxes, what should you ensure about the packing?
• The primary disadvantage of a hydraulic system compared to a mechanical system is:
• Which component in a hydraulic system is primarily responsible for converting fluid pressure into mechanical power?
• Which of the following is not a characteristic of clevis mounted cylinders?
• Machine units must be installed in a particular order to ensure satisfactory operation of the equipment. What is the correct order?
• What should be adjusted to eliminate forces from attachments that cause misalignment?
• Which material should not be used for hydraulic fluid conductors?
• What is a necessary action when using grout or epoxies for anchor bolts?
• What are the four factors that affect the mechanical properties of a metal?
• To attract particles using an electrostatic precipitator, you would use:
• According to Bernoulli's principle, a dynamic pump system has which of the following?
• On what component does the hydraulic fluid pressure entering an internal gear motor act upon?
• What can be added to a housing to help tighten a loose high-pressure lip seal?
• Cement base grout can be worked on in how many days and reaches full compressive strength after how many weeks?
• What component do gear pumps utilize to help offset side loading from being unbalanced?
• What characteristic does a foot valve provide to a pump system?
• To change the output flow of a fixed displacement pump, which of the following can be done?
• Which circuit design generates the least wasted heat?
• Which condition does not affect the efficiency of a hydraulic filter?
• What creates pressure in a hydraulic system?
• Is volumetric efficiency defined as the discharge fluid divided by the amount of leakage?
• Which type of foot correction should be made to avoid angular misalignment?
• What is the definition of work in a mechanical context?
• How does the capacity of a pump change when operated at a constant speed?
• Which component is essential for converting hydraulic energy into mechanical energy?
• What can misalignment cause in machinery?
• After installing a flow control, if the speed of the actuator is slow in the wrong direction, what is the likely cause?
• What is the significance of thermal growth in machine alignment?
• What is the most effective method for rating filters?
• For rough service environments, which impeller design is preferred?
• External gear motors operate by:
• What should the relief valve be set at for a hydraulic hoist that cannot lift over 5000 lbs, with a piston diameter of 10 inches?
• What does the designation 1020 signify in terms of steel type?
• What is one key function of a pressure reducing valve?
• What can cause operational difficulties in a hydraulic system?
• What is the primary purpose of an accumulator in hydraulic systems?
• What are the primary alloying elements in brass?
• If you express 5 US gallons per minute in cubic inches per minute, what is the result?
• If a pump is delivering a flow rate of 500 GPM and is operating at a total dynamic head of 150 ft, what is the pump performance in HP?
• Why is cross dialing used?
• What happens to gas molecules when heated in a confined space?
• When calculating the work done by a hydraulic cylinder, you must know the hydraulic pressure and the pistons:
• Bernoulli's principle states that the total energy of a hydraulic liquid is:
• How much is 1 bar equal to in psi?
• Can directional control valves be operated by multiple methods?
• What mechanism do large hand and wheel valves typically utilize for mechanical advantage?
• How would you describe oscillating motors?
• What characteristic differentiates axial fans from radial fans in terms of energy consumption?
• The energy stored in a material when it is deformed elastically is known as:
• When using a meter-out flow control on the cap end of a double acting cylinder, what is being controlled?
• What is a hydraulic accumulator primarily used for?
• Which type of vane pump utilizes an oval rotor in a concentric housing?
• Which numerical system is utilized to designate carbon and alloy steels?
• What type of compressor is classified as oil-free and uses liquid to seal spaces between impeller vanes?
• What component is used in a positive displacement pumping circuit to absorb cyclical flow variations?
• Which type of pump requires timing gears to operate?
• Convert 45 psi of oil with a specific gravity of 0.9 to ft of head of oil.
• What is the main function of a flow control valve in a hydraulic system?
• In the context of pumps, what does the term "cavitation" refer to?
• To prevent the amplification of internal stresses and absorb vibration, which devices are installed?
• Clevis mounted cylinders are used when the cylinder moves in which type of motion?
• What is the purpose of the extra cut in the stator of a vane compressor?
• To allow contaminants to separate from hydraulic fluid in the reservoir, the fluid?
• What method can be used to correct blade fouling in axial compressors?
• The type of stress that occurs when forces are applied parallel to the surface of a material is known as:
• What is the primary purpose of shim installation?
• How should anchor bolts be chosen for high vibration applications?
• What type of misalignment condition is most commonly encountered when approaching a machine?
• What is the effect of a pressure differential in a compressed air system?
• A perfect vacuum is achieved when the pressure is at?
• What term refers to the distance that a shaft runs out on a machine?
• A pressure gauge reads 500 psi. If it was pumping oil with a specific gravity (S.G.) of 0.75, what would the feet of head be?
• Which factor is least likely to cause a hydraulic actuator to fail?
• Which of the following materials can valves be made from?
• What is the primary drive mechanism in a hydraulic motor?
• Two pulleys have diameters of 10" and 12". If they are connected by a belt and if the large pulley rotates at 180 rpm, what is the rpm of the small pulley?
• What type of impeller has a double curvature vane?
• A differential cylinder is classified as which type of cylinder?
• A pump is supplying a plant with water 300 ft above it. The pump needs to be running with a pressure of 200 psi after supplying the water to the 300 ft level. What will be the discharge pressure at the pump?
• The use of a regenerative center in a directional control valve primarily aims to achieve which of the following?
• What kind of shimming technique is recommended to maintain stack integrity?
• Which foundation practice ensures proper alignment and prevents structural damage over time?
• A pressure reducing valve is defined as a normally closed valve. Is this statement true?
• What occurs when liquid is vaporized while being pumped?
• What is a good starting point to resolve hydraulic issues in a system?
• When dial indicator readings are taken on the rim of the coupling by rotating through 180 degrees, what type of misalignment does this indicate?
• What condition occurs when all supporting feet of a machine do not equally support its weight?
• In hydraulic systems, what does the term 'cavitation' refer to?
• At 1000 psi, how much will hydraulic oil compress?
• Which of the following leveling devices can be used on equipment?
• What constitutes environmental pollution?
• A hydraulic fluid that prevents contact between component metal surfaces is said to have good?
• To prevent cavitation, the NPSH available must be what in relation to the NPSH required?
• What is a sign of proper functioning in hydraulic pumps related to leakage?
• What type of cylinder is a stop tube used in?
• In cross dial alignment, the total indicator reading of the dials is equal to:
• What is one potential consequence of an over-pressured compressor separator?
• What is the typical degree position for measuring impeller to impeller clearance on lobe blowers?
• In a pump system, if contamination is present, which type of wear is likely to occur?
• What device is used alongside the unloading valve for automatic air control?
• What is the primary function of a fan within a pollution control device?
• In terms of their operation, hydraulic pumps are classed as?
• When working on a hydraulic system, what is always important to remember?
• What is the typical use of high-speed steel drill bits?
• Is it true that a manometer is an accurate means of reading a vacuum?
• What can elastomeric shims help correct?
• Soleplates for transmission and drive units are brought to what elevation?
• What is the preferred approach to pollution control?
• When troubleshooting a hydraulic system, the first step is to?
• What factors do friction losses through pipes depend on?
• Are plastic shims color coded?
• How is power calculated in physics?
• What is the pressure created by a 50 ft high column of oil with a specific gravity of 0.9?
• What is a disadvantage of using hoses in hydraulic systems?
• Why is it important to maintain hydraulic fluid cleanliness?
• What process occurs in an axial compressor with the rotors and stators?
• A single acting cylinder can be controlled by which type of valve?
• Which type of directional control valve is described as having a floating center?
• Why are pilot operated pressure reducing valves used instead of direct acting pressure reducing valves?
• In a closed circuit reservoir, the typical psi range used is?
• What does torque produced in a hydraulic motor depend on?
• Which of the following pump types is classified as non-dynamic?
• What procedure in foundation work eliminates concerns about foundation shrinkage and provides space for shimming to elevation?
• In the context of gas laws, what must temperature be converted to?
• What role does a hydraulic accumulator serve in a hydraulic system?
• What units can be used to specify the capacity of a pump?
• What is one of the main causes of misalignment in rotating equipment?
• What should be done when repacking valve stuffing boxes?
• Which type of metal typically exhibits greater resistance to deformation?
• To measure high temperatures up to 2400 degrees F, you would use:
• Which component in a hydraulic system controls the flow rate?
• How can an internal wear ring be successfully removed?
• What is a primary cause of aeration in a hydraulic system?
• What occurs within the furnace during forced draft operation?
• Which method can be used to find right angles for reference lines?
• What part of the valve does the bonnet contain?
• What happens to gas velocity in a pipe as the diameter increases, according to Bernoulli's principle?
• The characteristic of a fastener that allows it to return to its original length after tensile forces are removed is known as what?
• What is the recommended velocity for a hydraulic pressure line?
• Which of the following best describes the function of pressure control valves?
• What is the main purpose of having a bypass valve on a filter?
• When maintaining compressor separators, why should the staples in the gasket be removed?
• Why should a technician avoid using flared fittings in high vibration environments?
• When aligning machines, what type of errors can cause misalignment?
• How much force is required to lift a 200 lb weight with a class 1 lever, given the effort arm is 8 feet and the resistance arm is 2 feet?
• What is one of the primary functions of a hydraulic accumulator?
• Are all pressure control valves externally drained if there is pressure downstream of the valves?
• What is the converted mass of 225 kg into newtons when multiplying by 9.8 m/s²?
• What is the pressure setting of a counterbalance valve?
• In terms of pressure differential, what indicates the usage of carbon seals?
• Which type of shim is NOT recommended for making minor adjustments to correct misalignment?
• What type of fluids are diaphragm valves primarily used for?
• What is recommended to prevent contamination when sealing pipes?
• How many cubic inches of liquid are contained in one imperial gallon?
• The efficiency of a hydraulic pump tends to be high when it has a:
• What lines are utilized to determine a machine's elevation and horizontal position?
• In an open loop hydraulic circuit, the return line goes back to a reservoir that is how many times the volume of the rated capacity of the pump?
• What component converts an electronic signal from the feedback device to the servo valve in a servo system?
• In the process of rebuilding a centrifugal pump, what is the last check that should be performed?
• What is the primary function of valves in a hydraulic system?
• How does a single acting cylinder return from extension?
• What type of valve directs flow back to the tank when the desired accumulator pressure is reached?
• What mechanical property indicates a material's ability to absorb energy before fracturing?
• What amount of torque is produced by a hydraulic motor generating a pressure of 1770 psi with a 25 gpm pump at 1200 rpm?
• What is the main cause of about 80% of hydraulic component failures?
• This type of hydraulic fluid performs at higher temperatures and pressure than any other type of fluid?
• What type of pumps create flow and are categorized as positive displacement pumps?
• A pressure relief valve is typically located where in a hydraulic circuit?
• Water-based fluids that are glycol-based should have the pump mounted below the fluid level for what reason?
• Can laser detector calibration be checked but not re-calibrated?
• Is the machine center line considered the most important reference line?
• What type of heat transfer occurs when a fluid is heated, causing it to expand and become less dense?
• Can both low flow rate and low system pressure be related to a low setting on the relief valve?
• A straight anchor bolt should be installed to a depth of ______ while a bent anchor bolt should have a bent length of ______.
• What should be monitored to ensure hydraulic system performance?
• What is the change in length of a steel rod originally 36" at 68 degrees C when heated to 300 degrees C?
• The difference between the initial pressure which opens a valve and the pressure required to keep it open is called?
• In which environment should flared fittings not be used?
• When a relief valve is opened due to high pressure, where is the liquid returned?
• What is the function of the intra-vane in a vane pump?
• Where should shims be placed to correct vertical offset misalignment of a drive unit?
• What is a significant disadvantage of synthetic grout?
• If you were using a pump graph, what information would not be available from it?
• Which type of valve is used to limit maximum pressure in accumulator charging circuits?
• Which of the following is not one of the five important mechanical properties of a metal?
• What type of fluid is pump performance curves based on?
• How is mobility of equipment effectively accomplished when installing machines in modern manufacturing facilities?
• With the horizontal cross dial reading, you zero the _______ o'clock reading on dial B and the _________ o'clock reading on dial A.
• Corrosion in a hydraulic system is generally caused by?
• In what scenario would you most likely use a mechanical expansion anchor?
• When blinding piping for pump removal, blinds should be placed on?
• What is true regarding stress and strain in materials?
• What does it mean if a fluid is said to be incompressible in a hydraulic context?
• An unloading valve is primarily used to:
• When checking clearances, what is important to do with the impellers?
• What is the main purpose of a valve's working pressure rating?
• Which law states that pressure and volume are inversely proportional when temperature is held constant?
• What is the purpose of drilling two holes in a void when applying grout?
• What does a diagonal arrow in a hydraulic symbol indicate?
• Should all valves be checked for leakage?
• What technique should be avoided when using emery cloth on a shaft?
• Limit switches on cylinder actuators are used to confirm what?
• How is velocity pressure defined?
• What component is used in a closed loop hydraulic circuit to replenish fluid lost?
• What happens to gas velocity in an axial compressor rotor?
• What does increasing the pipe diameter do to the hydraulic fluid velocity?
• Which method is appropriate when using emery cloth on a shaft?
• To operate at 2 ft/sec with a 20 GPM pump, what diameter cylinder would you need?
• What does the presence of blisters in the outer rubber layer of a hose indicate?
• Is a load sensing compensator with a pressure limiting sensor considered a highly efficient hydraulic pump?
• When shafts are not aligned with each other in the vertical and horizontal planes, what is the most common symptom?
• Hydraulic motor speed is changed by the fluid's?
• What plays a critical role in preventing contamination in hydraulic systems?
• What is the maximum load a porta-power system can lift if the mechanical advantage of the handle is 15/1 with a ram diameter of 3 inches and a force of 50 lbs applied?
• What motor design may be used for hydraulic motors?
• Depth type media consists of what material that captures dirt?
• Which statement is true regarding proportional valves compared to servo valves?
• What drives hydraulic motors?
• If a solenoid controlled, pilot operated directional control valve will not shift, what can you do to check if it shifts manually?
• In the previous scenario, which compressor would use more power in the same time period?
• What is the effect when fans are mounted in series?
• If you can only take three readings around the 360-degree arc, what should you do to perform the alignment?
• What is the recommended depth for setting straight anchor bolts without deformed ends into foundation concrete?
• What is the primary purpose of a pressure relief valve in a hydraulic system?
• Where are diffusers typically mounted in relation to the impeller?
• Where do pressure reducing valves limit pressure?
• What design feature do forward curved fan blades have that enhances their performance?
• The gravitational pull on an object is expressed as its:
• What is typically used to drive the rotors in an unbalanced vane pump?
• What is the main purpose of the blow down valve in a compressor system?
• Which type of mounting is effective for eliminating soft foot and ensuring alignment?
• If a flow control has a bypass check valve, how many directions can flow be controlled?
• What function does the breather cap on a reservoir serve?
• How much horsepower is required to drive a pump in a hydraulic cylinder system with a return stroke force of 6000 lbs at a speed of 350 in/min?
• Which of the following factors affects the efficiency of a hydraulic system?
• What is the efficiency of a gear pump when new, and how does it compare to a piston pump?
• What is the role of a rod wiper in hydraulic systems?
• What function does a directional valve perform in a hydraulic system?
• What does a pressure control valve do in a hydraulic circuit?
• Regarding telescoping cylinders, which section moves first?
• Is it true that lapping 2 mating surfaces allows for a positive seal?
• Which hydraulic component is used to convert hydraulic energy into mechanical energy?
• Can O-rings in hydraulic systems be used as dynamic seals?
• In maintaining effective lobe blower operation, why is timing critical?
• What feature distinguishes stainless steel from regular steel?
• To minimize the springing effect from shims, what is the maximum number of shims that should be used?
• Which design of relief valve is more energy efficient?
• Cyclones rely on what forces to help separate out particulates?
• If a hydraulic system is overheating and producing excessive noise, what could be the likely cause?
• Hydraulic vane motors require what to help seal the vanes against the cam ring before the oil assists in operation?
• What can cause misalignment?
• Molecules in solids are strongly attracted to one another and this characteristic is called:
• Inside the casing, 2 and 3 lobe blowers:
• Which type of alignment setup would most commonly apply a bar sag measurement?
• If the oil in a hydraulic system has excessive foaming, what is the likely problem?
• Which misalignment condition occurs when the centerlines of the shafts are parallel but not in line?
• To correct vertical angular misalignment, where should shims be placed?
• What type of connections do the sub-plate ends for stack valves have?
• What do valve ratings indicate regarding their use?
• What does proper maintenance of hydraulic fluid include?
• What must be checked regularly in a liquid ring compressor to ensure optimal performance?
• Force in a hydraulic system is equal to what?
• What is likely the problem if a second cylinder does not move in a sequence valve system?
• A dial indicator touching the face of a shoulder on a shaft provides information about what?
• Which characteristic defines a dry screw compressor?
• What is the main purpose of a hydraulic circuit diagram?
• Which factor should lasers be protected from to prevent beam distortion?
• Aeration in a pump system is caused by which of the following?
• Compared to radial fans, axial fans generally require?
• Molecules that are not alike often share a force of attraction, this intermolecular force is called:
• Which of the following is NOT a common characteristic of hydraulic oils?
• What is static pressure developed by a fan?
• Most liquid-cooled heat exchangers transfer heat by means of which method?
• What characteristics of a hydraulic conductor are the most important?
• A balance vane pump has how many pumping chambers and what specific configuration?
• A pump displaces 350 psi. The line pressure at the plant discharge is 100 psi. How much higher is the plant above the pump?
• The main difference between pilot operated and direct acting valves is:
• What is the purpose of the cushioning device in a hydraulic cylinder?
• To successfully align shafts, which two misalignment conditions must be corrected?
• What does excessive noise from a hydraulic pump usually indicate?
• What does the baffle in a hydraulic tank do?
• Diffuser rings are designed to do what in centrifugal fans?
• How is spool movement in a proportional valve controlled?
• For installing anchor bolts in existing concrete, which type of anchor bolt is most commonly used?
• What is the volumetric capacity of a cylinder with a 6" diameter and 18" stroke?
• Dial bar sag is applied to which readings when doing cross dial readings?
• The maximum atmospheric pressure is typically recorded at?
• What happens to pressures when air travels through a restriction?
• What should be ensured when installing hydraulic hoses?
• What is the primary direction of heat transfer?
• What is one way to calculate the efficiency of a pump?
• A sequence valve is primarily used for?
• Most laser systems require a minimal rotation of how many degrees?
• What is a common cause of hydraulic fluid overheating?
• When leveling equipment on concrete floors with screws and bolts, what is used to prevent the machine from moving?
• What happens when the pressure setting of a pressure relief valve is reached?
• What component is typically used for speed control in hydraulic applications?
• When reading a dial indicator, what does the difference in reading from top to bottom represent?
• When measuring airflow velocity, what tool is primarily used?
• What does Bernoulli's principle state regarding fluid motion?
• This type of gas is used in accumulators because of its inert qualities.
• In a proportional valve system, which statement is correct about the valve spool?
• Which of the following is NOT one of the three major types of stainless steel?
• According to Pascal's law, what happens when a force is applied to a fluid at rest in a confined space?
• High pressure diaphragm pumps utilize which fluid to activate them?
• What does "MTBM" stand for in the context of machinery alignment?
• What type of valves utilize a stem that extends through a bonnet?
• What characteristic differentiates a compound (pilot operated) relief valve from a direct acting relief valve?
• What will happen to the pressure of gas as it is compressed in a smaller volume, assuming constant temperature?
• Which term describes the thickness of material used to achieve level alignment in machinery?
• What component helps to keep the rod clean and protects the rod seal?
• When installing non-expandable anchor bolts with grout or epoxies, what is required?
• What is a common application for diaphragm pumps?
• What would be the feet of head for the pumping curve?
• Which type of cooler is more efficient in controlling temperature accurately?
• What type of anchor bolt has a design that allows for slight corrections in alignment?
• What is an essential principle of hydraulic systems concerning fluid pressure?
• Are gear pumps categorized into two basic designs: in-line and external gear?
• How is resistance in an electrical circuit measured?
• What happens to the elasticity of a fastener when exposed to high stress for prolonged periods?
• How is surge control typically achieved in a compressor system?
• If a counterbalance valve will not let the load lower, what type of problem is likely occurring?
• Which lines are established on the machine base for determining the exact position of the machine?
• What happens when there is insufficient NPSH available for a pumping operation?
• What type of valve is a pressure reducing valve?
• This instrument measures temperatures beyond the range of ordinary thermometers and relies on the color produced by the object being heated:
• Deceleration circuits in hydraulic systems are designed to:
• The concept of "end float" in machinery refers to:
• What is the primary function of guide elements in a multi-stage centrifugal compressor?
• What is the correct flow path for an external gear pump?
• Which type of hydraulic fluid is known for its biodegradability?
• Cross-port relief or cushion valves are typically used with what type of hydraulic component?
• What is the usable time of a synthetic grout?
• How does reducing pipe friction in a hydraulic system affect performance?
• How does the flow of a right angle check valve compare to that of an inline check valve?
• What is one of the primary purposes of hydraulic fluid in a hydraulic system?
• What is the result of air flowing through a dynamic compressor?
• Which statement best describes how pressure is measured in hydraulic systems?
• The travel speed of a hydraulic actuator is controlled by what characteristic of the hydraulic system?
• What is a potential output speed for a gearbox that includes a 10-tooth driver gear and a 40-tooth driven gear?
• What is the most likely cause of excessive dial movement when torqueing down bolts after adding shims?
• In a double-rod end cylinder, the piston surface areas are always:
• What component is unique to servo valves?
• Changing an impeller's diameter affects which of the following?
• What is the function of a bypass check valve in hydraulic systems?
• A pressure gauge reads 350 psi. If it was pumping water, what would the ft of head be?
• Which statement accurately describes the action of a hydraulic cylinder?
• What type of energy do pumps primarily convert into hydraulic energy?
• What is the appropriate spindle speed to drill a ¼" diameter hole in a 3" diameter stainless steel piece using a high-speed steel drill bit?
• Which equipment is most efficient for removing air particulates?
• Dynamic O-rings have the same amount of squeeze as static O-rings?
• What is the primary function of a bleed port in hydraulic systems?
• How does surface finish of pipes influence friction losses?
• Contamination in a hydraulic system can be best controlled by?
• Where does cavitation damage primarily occur in a pump?
• What is the smallest particle of a substance that retains its characteristics?
• Which of the following is NOT a measurement entered into the laser unit?
• When plotting the centerline of the machine in a cross dial alignment, which dial readings are used?
• What formula is used to calculate the change in length of a steel rod with respect to temperature change?
• What is the formula for calculating the speed of a pulley system?
• Can hydraulic systems operate at pressures exceeding 3000 psi, and what could happen if oils at that pressure come into contact with skin?
• Which type of compressor would use a series of vanes to compress gas?
• In a lobe pump, the lobes rotate to create what type of flow?
• What effect does cavitation have on a pump system?
• For every 10 degrees C above 60 degrees C, the oxidation rate of hydraulic fluid?
• The following is a measurement of the amount of space an object occupies:
• The relationship between stress and strain in materials is described by:
• Which of the following is not a characteristic of ductility in metals?
• In situations where hold-down bolts are subject to severe vibration, what type of anchor bolt is typically recommended?
• What components in servo valves regulate the position of the spool?
• For an alignment setup with X=10", L1=20", L2=40", and dial B= +7 with a 6 mil bar sag, what are the vertical moves for shim moves?
• What types of chambers do all hydraulic pumps have to create the pumping action?
• Carbon seals are typically used in which pressure condition?
• Flareless fittings are typically used with what type of tubing?
• What can filters in a hydraulic system do?
• What is a characteristic of thrust bearings used in dynamic compressors?
• Radial piston pumps are operated by a central cam that drives the pistons in and out of the cylinder. Is this statement true or false?
• Which property is critical for calculating the pressure needed to cut steel in hydraulic shears?
• If hydraulic fluid is not properly lubricating components, what could be the most likely cause?
• What issue is typically associated with hydraulic motors that are not producing full torque?
• What is required to break a partial vacuum when taking apart a positive displacement pump?
• True or False: Multi-stage centrifugal compressors increase discharge pressures by enhancing volume and pressure ratio.
• What allows a cylinder to extend at full speed and then slow down near the end of the stroke?
• Do proportional and servo valves have an infinite number of positions available when shifting the spool?
• What are the three physical states of matter?
• What is a common application for using a V-belt drive?
• When is a check valve closed in a hydraulic system?
• What type of compressors use oil to both cool compressed air and seal between the rotors?
• During end cover to stator match marking, which method should be avoided to prevent damage?
• What is the gear ratio of a system with gears having the following configurations: 10t, 20T, 15T, and 30T?
• The force ordinarily present in a cable supporting a load on a crane is:
• Which of the following is considered a characteristic of a rotary compressor?
• In a hydraulic system, how does an increase in pressure affect motor performance?
• What is the function of the check valve in a minimum pressure valve?
• Directional control valves can be:
• What type of valve is most commonly used to control the speed of a hydraulic actuator?
• In the flow triangle, speed is measured in what unit?
• What is the primary function of a maximum pressure relief valve in a hydraulic system?
• Oil seals on blowers are generally of which type?
• Do the spools in proportional valves feature metering notches?
• What must be carefully positioned when overhauling sliding vane compressors?
• What is the best action to take when troubleshooting a hydraulic system?
• If you adjust a pilot operated pressure reducing valve and experience no pressure change, what could be the issue?
• Which type of anchor bolt is favored for its ability to allow slight movement in case of layout errors?
• 2 and 3 lobe blowers are characterized as which type of volume and pressure machines?
• What characteristic should the bottom of a hydraulic reservoir have?
• What is the purpose of a pressure relief valve in a hydraulic system?
• What is used in the mixture for grout to achieve a fluid consistency?
• Oil relief valves help prevent which of the following issues?
• Is it true that the reflector sends the beam back to the transmitter and any change in position indicates misalignment?
• What happens to air in a cylinder during the proper installation process?
• Which of the following does NOT represent a form of pressure measured by fans?
• Which component is used under leveling screws or bolts to prevent digging into the foundation?
• How does temperature affect oxidation rates in hydraulic fluids?
• What is the mixture for grout used for filling anchor bolt holes?
• Calculate the speed that a piston will retract if it has a 6 inch diameter piston face, a 1 inch diameter piston rod, and a fluid supply of 15 GPM.
• Which type of axial thrust bearing is commonly used?
• Which one of the following steps is not considered important when installing machines?
• When using a steam turbine, where should the shaft be set in relation to the primary unit due to thermal growth?
• What aspect of hydraulic systems allows them to transmit power?
• The theory that pressure in a confined liquid is distributed equally and undiminished throughout the liquid is called:
• What is the potential consequence of a relief valve malfunctioning due to a broken spring?
• Which of the following properties is a measure of a material's resistance to deformation?
• Machine units that do not share a common baseplate and require alignment to other units should not be mounted directly onto a foundation. They are set and fastened to:
• What are the two main classifications of compressors?
• How can thrust control be achieved in dynamic compressors?
• What is the rpm of a 6" pulley connected to a 16" pulley that is turning at 150 rpm?
• Which valve can control the cushioning in a hydraulic cylinder?
• What materials are recommended for vanes in an oil-free vane compressor?
• What is the function of a brake valve in hydraulic systems?
• Double suction single stage pumps have which characteristic?
• If a screw compressor has low air delivery, what could be the possible reasons?
• How can soft foot be checked?
• Can a hydraulic system have both air in the fluid and insufficient lubrication simultaneously?
• If you find that 0.125" shims are needed under one end of a 4' long base plate using a 1' level, how much should be added under the base plate to level it?
• Which type of hydraulic pump allows the same amount of fluid to be moved regardless of pressure changes?
• When using a baghouse, the choice of filter bags is based on:
• What is the purpose of pressure compensators in flow controls?
• What is one significant advantage of using a hydraulic cylinder instead of pneumatic?
• Which of the following statements best describes the alignment process using laser systems?
• What term describes the stability of fluid viscosity when it is heated?
• What characterizes hot-rolled steel in terms of its surface condition?
• In terms of pressure, how is it generally distributed in a closed hydraulic system?
• What is a hydraulic tank with the pump mounted inside called?
• What primarily shifts the main stage spool in a solenoid controlled, pilot operated directional control valve?
• To test a cylinder for leaks, is it true that you should pressurize either end and check for oil coming out the other end?
• Which of the following describes an ideal flow condition in a hydraulic system?
• What is the position at which dial bar sag is applied for dial B?
• Why are gate valves not used for throttling?
• What type of alignment is done before correcting soft foot?
• When calculating any gas law, what must you always convert?
• Cushions in hydraulic cylinders serve what main purpose?
• How can you identify a dry screw compressor when it is disassembled?
• What is the required number of teeth for a gear that turns at 200 rpm when in mesh with an 80 tooth gear turning at 500 rpm?
• Where should the return line outlet be in relation to the fluid level?
• What is the accuracy of a high-accuracy, short distance laser?
• What happens if orbiting gear motors and roller vane gerotors are timed incorrectly?
• What effect does cooling the hydraulic fluid have on system performance?
• Offset misalignment in alignment setups is measured off of which part?
• Which pump type is known for its ability to handle high viscosities without significant shear?
• What does a higher viscosity in hydraulic fluid imply?
• In a 2 to 1 cylinder, what does this ratio indicate regarding the piston areas?
• What affects the speed of a hydraulic motor?
• A variable displacement rotary pump uses a component that moves from side to side to change the volume of the pump. What is this component?
• If a knocking sound is heard inside the blower, what might this indicate?
• Which factor can affect the accuracy of the alignment?
• What characteristic is commonly associated with torquew motors in servo valves?
• When should a gear's tooth count be adjusted in a system of meshed gears?
• How are IOS cleanliness targets for a hydraulic system verified?
• Which of the following factors affects the Net Positive Suction Head available (NPSHa) when using a pump?
• Which fan blade type produces the highest air velocity?
• What is the purpose of dither in valve operation?
• For a V-belt designated as A-48 51, what is the actual length of the belt?
• How does the size of a differential cylinder affect its operation?
• What is the absolute scale that works with Celsius?
• Which type of misalignment could be described as both angular and offset at the same time?
• What can cause cavitation in a pump?
• Why misalign a set of machines at the coupling when performing an alignment?
• What type of seal is best for protecting fan bearings when handling abrasive materials?
• The higher you are from sea level, the atmospheric pressure will be?
• Which type of anchor bolt is most effective in applications that experience high levels of stress and vibration?
• According to Pascal's law, what statement is correct?
• Which type of oil is deemed safest for quenching oil-hardening parts?
• What is a primary requirement for hydraulic fluids?
• What effect does viscosity have on flow control in hydraulic systems?
• Ductility allows a material to:
• What is the carbon percentage in 4130 alloy steel?
• Which factor significantly affects the operation of hydraulic systems in terms of flow?
• What diameter pulley should be installed on an electric motor running at 1,600 rpm to achieve 2,000 rpm on a 10" diameter pulley?
• What is the main function of hydraulic fluid?
• What device is used to measure static head, velocity head, and total head in a fan discharge duct?
• How can flow in a hydraulic system be expressed?
• What is a characteristic feature of helical lobe blowers?
• What is the function of the minimum pressure valve on a wet screw compressor?
• Which problem can lead to a hydraulic system being unresponsive?
• When disassembling a back pullout design centrifugal pump, what is the first step you should take?
• Which tool is most critical for ensuring alignment accuracy when the equipment is being operated?
• What is the main purpose of tempering steel after hardening?
• What is the primary reason for installing an air-breather on a hydraulic reservoir?
• If an 80 tooth gear turns at 250 rpm, what is the rpm of a 120 tooth gear it is meshed with?
• What is the size of a class D shim?
• What is the result of a filtered hydraulic system regarding contaminant levels?
• What is a likely cause of hydraulic slap?
• When lubricating the valve stem packing, where else should oil be applied?
• What is the BHP for the pump curve mentioned in the text?
• What should be done to understand the behavior of a servo valve in a control system?
• In preparing for alignment, which should be done first after ensuring lockout/tagout has been applied?
• Which mounting style is an example of a rotor disc blade configuration?
• How does a hydraulic system transmit power?
• What outcome is desired from the interaction between rotors and stators in an axial compressor?
• What component provides support to the weight of the machine set directly to the floor and screws into threaded holes in the machine base?
• After locking out a breaker at the M.C.C., what should you do before commencing with a coupling alignment?
• Rupture disc relief valves are used with which type of valve to stop the flow of fluid?
• To align two machines with a 45 mil gap on the top and a 25 mil gap at the bottom, which shim moves are required?
• What is the main benefit of variable pitch fan blades?
• Is polymeric grout known to be non-shrinking?
• Which of the following is not a hydraulic tank type?
• What does the "B" stand for in the thread designation of ¾" - 10 UNC - 2 - B - LH?
• Which type of cartridge valves is used for larger flow rates?
• What is the weight of one cubic foot of steel?
• What creates the flow in a hydraulic system?
• Timing gears in blowers should have what quality?
• What component is responsible for cooling compressed air in a liquid ring compressor?
• Why is it important to maintain specific elevations of primary units?
• What type of collector is a scrubber and which components can be used to disperse the droplets?
• What is a common indication of a problem with hydraulic hoses?
• Which pollution control device operates similarly to a vacuum cleaner and can remove very fine particles?
• When installing cylinders, once it is filled with oil, what is the next step?
• Which condition would indicate that the machine might be experiencing softfoot?
• What effect do radial blades have on incoming air?
• When aligning machines, what is commonly checked to ensure proper adjustments?
• What is the primary benefit of protecting against water contamination in hydraulic fluids?
• What is the relationship between angular misalignment and offset misalignment?
• Which of the following is NOT a step in the alignment process?
• Which type of fan creates a smooth helical flow pattern that increases static pressure?
• What can be used to enhance environmental safety in hydraulic systems?
• What is the effect of excessive bearing clearances on alignment?
• Leakage from the discharge back to the inlet on a blower is referred to as:
• When reconditioning the filters of a baghouse, what method can be used?
• What could happen if you install the pump with the wrong impeller rotation?
• What is the typical purpose of a hydraulic accumulator?
• From which part of the reverse flow cyclone is cleaned air expelled?
• What does proper torquing of bolts prevent in machinery?
• Which units are commonly used when measuring angles?
• When dealing with fans, 1 psig will support how many inches of water column?
• The unbalanced vane pump rotor is driven by a certain mechanism supported by specific bearings. What is this mechanism?
• What causes water hammer in a piping system?
• Which valve issues might occur while troubleshooting hydraulic systems?
• A combination disc and drum balancing device will do what?
• In a vane pump, should the trailing edge of the vane always face away from the feed notch?
• Which advantage do adhesive anchor bolts have over expansion bolts and sleeves?
• Variable capacity control can be achieved by manipulating which components together or independently?
• How many times does fluid change direction in a globe valve?
• Which statement best describes the role of hydraulic filters?
• Where does a pressure compensating valve sense pressure in a hydraulic circuit?
• Where can leakage in a screw compressor occur and how can it be partly eliminated?
• Which of the following will not be affected when using the impeller size to adjust pump capacity?
• How does the degree of linear expansion for a material generally vary?
• What is the operating differential pressure of a relief valve calculated from?
• During the laser alignment process, what must be done with the target sensor to ensure accurate readings?
• What is a key advantage of a flexible vane pump?
• In stack valves, which valve is typically mounted first on the sub-plate?
• Which type of alignment can a dial indicator help verify?
• What instrument is normally used for precision leveling?
• Why is it important to have a check valve in the inlet filter?
• What diameter of cylinder is necessary to lift 5500 lbs using a pressure of 1000 psi?
• How is heat dissipation accomplished in fan shafts operating at high temperatures?
• What is a common reason for beam distortion in laser alignment?
• Is the statement true or false? "The valves would be tested according to the valve class and simulate operating conditions."
• What is essential for maintaining the integrity of hydraulic oil?
• What determines the speed of an actuator in a hydraulic system?
• The function of a relief valve is to:
• How is a directional control valve actuated?
• To select the proper filter for your system, one should use?
• What purpose do labyrinth seals serve in axial flow compressors?
• To resolve issues in a system with multiple branches, what tool is recommended?
• Centrifugal fans are known for which characteristics?
• How can displacement control for a screw compressor be achieved?
• Do detents help the valve hold the spool in the different positions the valve has?
• What is an adequate size for a reservoir in a system with a 20 gpm pump?
• What is the atmospheric pressure at sea level?
• Why is the gerotor internal gear pump known for being quiet running?
• What condition is achieved when accurate shaft alignment has been achieved?
• Why should laser alignment systems be shielded from strong heat sources?
• What should be done after recording readings during laser bore alignment?
• The cross dial method uses 2 dials mounted ___________ across from each other.
• In what scenario is a labyrinth seal preferred over other seal types?
• In which unit is the current flow in an electrical circuit measured?
• What activates the plate and nozzle type pressure controls in a proportional valve?
• What symptom indicates that a hydraulic pump has lost efficiency?
• How many meters is one micron equal to?
• Which condition is false regarding synthetic grout?
• What type of misalignment occurs when the centerlines of two shafts are not parallel?
• What is the primary purpose of a hold-down bolt in machine installation?
• What occurs when a 1" pipe is changed to a 2" pipe regarding the cross-sectional area?
• What is the primary purpose of seals in hydraulic equipment?
• Hydraulic cylinders convert fluid force into which type of motion?
• What is one of the functions of hydraulic fluid related to temperature?
• What happens if a twenty-five micron filter is replaced by a forty micron filter?
• When referring to the ability of a material to resist external forces that push into or against the material we refer to the material's:
• Can a bent axial piston pump tolerate a high vacuum at the inlet, allowing it to be mounted above the fluid level?
• Which design is NOT typical for gear pumps?
• Does the vane pump utilize centrifugal force to seal the vane against the cam ring?
• What safety concern is associated with the preload spring in an axial piston pump?
• Why is it important to keep threads clean when installing anchor bolts?
• A tachometer is useful for troubleshooting which of the following issues?
• Which sieve number represents the finest screen?
• In which direction does the force of a double-acting cylinder act?
• What is a characteristic feature of globe valves related to fluid movement?
• Should lubricant be applied to packing in a valve?
• What type of pollution control device is designed to deliver large volumes of air at relatively low pressures?
• When taking dial indicator readings for misalignment, how should the coupling halves be rotated?
• What is the primary purpose of performing a laser bore alignment on an engine block crank journal?
• What is true about heat transfer by conduction?
• Before beginning any alignment, what should you check for?
• What effect does a hydraulic pump’s flow have on hydraulic motors?
• Three factors affecting flow rate include pressure, fluid temperature, and orifice size. If any of these factors is increased, the flow rate will not increase. True or False?
• What is the primary reason for using oil in an oil-flooded screw compressor?
• Hydraulic cylinders convert which type of energy to another type of energy?
• What is true about pilot to open check valves?
• What type of motion is produced by a gear train with a combination of clockwise and counterclockwise rotation?
• A stuck relief valve can lead to what issue in a hydraulic system?
• What is the effect of using a sequence valve in timing control of actuators?
• What is the purpose of a sandwich diaphragm in a hydraulically activated diaphragm pump?
• A single screw compressor has how many main rotors and what type?
• What is the primary purpose of valve packing in a pump?
• Which principle does a dynamic compressor operate on?
• What is the component of a dial indicator that must be zeroed out before any readings can be taken?
• Which component is necessary to prevent a machine from shifting when it is tightened down?
• Which type of valve is most effective for flow regulation?
• What term describes the ability of alloy steels to retain hardness at high temperatures?
• What are jacking bolts or screws used for?
• What is a possible cause for erratic movement in hydraulic actuators?
• What happens to the oil pressure if the filter becomes clogged?
• What is the main purpose of hydraulic fluid in a system?
• Why are bleed-off flow controls preferred in hydraulic systems over meter in and out flow controls?
• Which statement is true about cohesion?
• What can cause excessive heat in a hydraulic system?
• What is the purpose of increasing RPM during blade fouling maintenance?
• When a dampener is closed, all pressure in the system changes to?
• What type of valve is used to control a vertical cylinder and prevent it from falling freely?
• What is the preferred method to ensure tightness when using a lip seal?
• Fluid flow in an efficient hydraulic conductor system should be:
• Are needle valves used for precise fluid control?
• What is a common symptom of a malfunctioning pressure reducing valve?
• Are primary units accurately brought up to their required elevations?
• What type of pipe threads are typically used in hydraulic lines?
• Tempering, or drawing, involves which of the following processes?
• Which type of hydraulic cylinder provides force in both directions?
• Which part of an atom carries a positive electrical charge?
• If you wanted to produce high pressure and low volume from a screw compressor, which configuration would you use?
• When does a counterbalance valve start to open?
• What is the primary function of an accumulator in a hydraulic system?
• Which component in a pollution control device is responsible for creating airflow?
• What are devices that measure position, pressure, or velocity known as?
• What component should be checked if a compressor exhibits low performance?
• In an internal gear pump, how does the crescent seal function?
• What is the best operating range for all dynamic compressors?
• What is the most common type of misalignment found in machinery?
• How soon after hardening should tempering be performed on steel?
• Which type of fan operates in significantly higher temperatures and deals with boiler ashes?
• Which blade type allows for increased velocity of air while the fan is running?
• What condition is described when the pump inlet is above the liquid level in the supply reservoir?
• What can filter carts do?
• To calculate the best graph scale to use on the paper, the smallest alignment measurement is divided by which number?
• Which type of anchor bolts are used on equipment with high vibrations and are not grouted in place?
• If a cylinder is exhibiting jerky movement or squealing, what is the most likely cause?
• If you had a pumping arrangement with a pump pumping water uphill 300' at a rate of 950 GPM with a constant pressure of 50 PSI at the top, what would the discharge pressure be?
• What is the primary function of an interior baffle in a hydraulic reservoir?