Millwright Hydraulic Pumps and Actuators 3rd Year Practice Test

These questions are part of the practice quiz. Start practicing

• What effect does hydraulic fluid have on the performance of hydraulic systems?
• Why is an ORB fitting often preferred over a tapered thread fitting?
• When changing a valve assembly on a radial piston motor, why is it important to mark the position of the drive coupling?
• Which of the following is a type of hydraulic valve?
• Why do gear pumps require heavy needle bearings?
• What is the main purpose of a pressure gauge in a hydraulic system?
• Which type of piston rings would you use if no creep could be tolerated?
• What is caused by failed rod seals?
• How does a hydraulic system minimize heat generation?
• Which factor is important for preventing cavitation in a hydraulic system?
• What does 'hydraulic horsepower' measure?
• Which type of pump typically requires less maintenance and offers higher efficiency?
• What dangerous condition can develop if you shut off the cushion valve at the rod end of a loaded cylinder?
• Why are seals critical in hydraulic systems?
• How can you detect an internal leak in a cylinder?
• Why is it critical to align a cylinder with the load it is attached to?
• What is the primary advantage of using a charge pump in hydraulic systems?
• How do you typically determine the horsepower required for a hydraulic pump?
• What determines fluid pressure in a hydraulic system?
• What is the basic operating principle of any positive displacement pump?
• Which swash plate control regulates the flow to suit any given load?
• What is a common reason for a hydraulic system to exhibit lower efficiency?
• What characterizes a bi-directional hydraulic actuator?
• Which hydraulic component is primarily designed to control fluid flow within the system?
• Why is it essential to filter hydraulic fluid regularly?
• What is 'back pressure' in a hydraulic circuit?
• What is a double acting cylinder?
• What function do cylinder cushions serve in a hydraulic system?
• Why is it important to choose the correct viscosity for hydraulic fluid?
• What is the main reason for using pressure limiting and load sensing compensators?
• Should you expect a new gear pump to be more efficient or less efficient than a piston pump?
• Which two methods are typically used to hold the vanes out against the cam ring on a vane pump?
• What is the impact of misalignment of a cylinder during installation?
• Why is it critical to maintain proper fluid levels in a hydraulic system?
• On a gear pump, do the teeth go into or come out of mesh at the inlet?
• Which additional parts are found in vane motors that are not normally found in vane pumps?
• What is the function of a pressure relief valve?
• What impact does fluid contamination have on a hydraulic system?
• What is a key benefit of using hydraulic motors in industrial applications?
• Which of the following methods can push fluid into a pump outside of atmospheric pressure?
• What type of pump is known for being able to maintain consistent flow rates despite changes in pressure?
• What are some root causes of heat discoloration on a cam ring that should be checked?
• What will happen if the pressure in a hydraulic system exceeds the maximum limit set?
• On an internal gear pump, should the inside gear have the same number of teeth as the outside gear or should it have fewer teeth?
• How can you change the output of a gear pump?
• What is a sign of cavitation in a hydraulic pump?
• How does a fixed displacement pump differ from a variable displacement pump?
• What types of maintenance are crucial for hydraulic pumps?
• Which principle explains the operation of a hydraulic press?
• Which device measures the hydraulic pressure in a system?
• What does an accumulator do when pressure drops in a hydraulic system?
• Which two indications suggest cavitation or aeration damage in a vane pump?
• What occurs if the load sensing compensator is set to zero psi?
• Why is it better to locate a pump below the level of the fluid?
• What type of energy does a hydraulic motor convert?
• Which part of a radial piston pump drives the pistons?
• What might cause a hydraulic actuator to fail?
• Which types of motors are commonly used for low speed and high torque applications?
• What is the significance of the "M" prefix in a model number for hydraulic components?
• What is the consequence of air being trapped in a hydraulic system?
• Which component is responsible for maintaining pressure within a hydraulic system?
• Which type of motor can only turn part of a rotation?
• Under what condition should you use cylinder cushions?
• If the crescent seal in an internal gear pump becomes worn, what happens to the flow inside the pump?
• Why is it best to install a cylinder with the ports at the top?
• When would you require a cushion bypass?
• How many inlet ports and how many discharge ports would you see in a balanced vane pump flex plate?
• How can you change the direction of rotation in a balanced vane pump?
• What does a decrease in volumetric efficiency indicate?
• When does a gear pump experience cavitation?
• What can you do to repair a gear pump if only the wear plates are scored and the tips of the teeth have sharp edges?
• When employing a variable displacement pump, what can directly affect flow rate?
• Which of the following factors could reduce the efficiency of a hydraulic system?
• What could happen if a pump is operated without sufficient inlet flow?
• Hydraulic filters help to maintain system efficiency by:
• What is the primary function of a hydraulic accumulator?
• Which component converts hydraulic motion back into linear mechanical motion?
• What is the primary purpose of hydraulic pumps in millwright applications?
• Which is NOT an indication of contamination damage in a vane pump?
• What are two ways that the swash plate angle affects the performance of an in-line axial piston motor?
• How does a gear pump generate flow?
• What can result from hydraulic fluid temperature being excessively high?
• What is the purpose of a hydraulic intensifier?
• What is one of the primary advantages of hydraulic systems?
• What can excessive pressure in a hydraulic system lead to?
• Why is understanding hydraulics important for millwrights?
• What is the relationship between viscosity and temperature in hydraulic fluids?
• What is a common consequence of incorrect hydraulic system setup?
• What does a decrease in mechanical efficiency indicate?
• What could be a potential consequence of improper installation of hydraulic fittings?
• What is the primary benefit of using hydraulic systems in machinery?
• What is the difference between a single-acting and double-acting hydraulic cylinder?
• Should you normally install a cylinder with the ports at the top or the bottom?
• What is cavitation in hydraulic systems?
• What is the primary function of hydraulic actuators?
• What is a critical safety precaution when working with hydraulic systems?
• What could be an effect of using a hydraulic fluid that is too old?
• What can be used to prevent cavitation in a hydraulic system?
• Which maintenance practice is essential for prolonging the life of hydraulic components?
• What three specifications determine the torque in a motor?
• What happens to the volume of pumping chambers at the inlet of a pump?
• What is the primary cause of cavitation in a pump?
• What is the operating principle of any hydraulic motor?
• What is a common example of a positive displacement pump?
• What role does the swash plate play in an axial piston motor?
• Define 'hydraulic circuit.'
• What is a primary advantage of hydraulic systems over pneumatic systems?
• What principle do hydraulic pumps operate on?
• How can the stroke on a bent axis piston pump be increased?
• What is the rotation direction of a factory rebuilt balanced vane pump?
• What does the term 'fluid dynamics' encompass in hydraulic systems?
• Which seals are contained in the rod bushing?
• What is the role of a hydraulic pump?
• How can the stroke of an axial piston pump be increased?
• Which component is essential for timing when replacing a valve assembly on a motor?
• How is hydraulic fluid different from water?
• Which factor is NOT known to influence the efficiency of a hydraulic pump?
• Which component prevents wear and damage in hydraulic systems?
• How is the fluid ported in and out of a radial piston pump?
• Name a common type of hydraulic pump used in millwright applications.
• Does the space between the vanes and the cam ring increase or decrease at the discharge port in a vane pump?
• What is the role of hydraulic fluid in a hydraulic system?
• When is it necessary to install a stop tube?
• What does a hydraulic system schematic represent?
• Should you be able to slide the rotor and rollers together easily on a roller vane gerotor?
• How do hydraulic pumps influence the efficiency of hydraulic systems?
• Why is it worthwhile to examine a pump that you are about to replace?
• If you rebuild a gear motor with new parts and find it turns freely by hand, what is likely the problem?
• What is one method used for changing the output of a pump?
• Which is the best pump to use if you have to locate it above the surface of the fluid?
• What type of wear is most likely to occur if a gear pump experiences prolonged cavitation?
• Which component in a hydraulic system controls the maximum pressure?
• Why is a very close fit necessary between the teeth, and between the teeth and the casing on a gear pump?
• Does the space between the vanes increase or decrease at the inlet?
• Which component is essential in converting hydraulic energy into mechanical work?
• How can you change the displacement of a cam-type radial piston motor?
• What does the term 'load sensing' refer to in hydraulic systems?
• On which two factors does motor speed depend?
• In what scenario would you use a hydraulic hose over a rigid tube?
• Which type of limited rotation motor can be used for clamping?
• What factor is essential for the successful operation of hydraulic actuators?
• How is flow direction controlled in a hydraulic system?
• How is the flow rate calculated in a hydraulic system?
• Which factor primarily determines the flow rate in a hydraulic system?
• If the supply is normal to a radial piston motor, but it runs slower than normal, what should you check first?
• What occurs when cavitation happens in a hydraulic pump?
• From which end of the pump is the direction of rotation defined?
• How does hydraulic pressure influence flow rate in a hydraulic system?
• What happens to a hydraulic cylinder when pressurized hydraulic fluid is introduced?
• What might indicate a malfunction in a hydraulic actuator?
• What is the purpose of the bias piston in an in-line axial piston pump?
• If a pump is positioned above the liquid surface, what helps in pushing fluid into the pump?
• In hydraulic systems, what is typically used to ensure the system is sealed and to prevent leaks?
• What are three methods of ensuring adequate inlet flow?
• What is the primary safety concern when working with hydraulic systems?
• What type of hydraulic pump is characterized by the use of rotating vanes?
• Which type of pump is generally more compact?
• What happens if you do not time a radial piston motor correctly?
• How is the flow rate from an in-line axial piston pump increased?
• What is a common indication of a healthy hydraulic system?
• What does the term 'named pressure' refer to in hydraulic systems?
• What is the maximum efficiency that you can expect from a new gear pump?
• How can flow be increased from a rotary piston pump?
• What function does a flow meter perform in a hydraulic circuit?
• What condition occurs when the inlet flow is less than the discharge?
• What does hydraulic fluid viscosity affect in a hydraulic system?
• What is the expected level of internal leakage in a new pump?
• What must be done to a new or rebuilt pump before installation?
• Which direction of rotation are factory rebuilt or new balanced vane pumps typically assembled for?
• What are common signs of hydraulic system failure?
• What is the primary function of a directional control valve?
• Explain the term 'actuator efficiency.'
• Which type of cylinder is used in a hydraulic jack?
• What are two symptoms of wear from contamination in gear pumps?
• What primarily determines the volumetric efficiency of a gear pump?
• What happens if you try to start up a vane motor without the springs in it?
• What is one common cause of hydraulic pump failure?
• What are two reasons for using cast iron piston rings?
• Which type of hydraulic cylinder uses hydraulic fluid on both sides for motion?
• What do pumps primarily create in hydraulic systems?
• What does the term "pressure drop" refer to in a hydraulic system?
• What maintenance action can reduce the risk of contamination in pumps?
• Which application is commonly found in millwrighting that utilizes hydraulic systems?
• Why are positive displacement pumps preferred in hydraulic applications?
• What should be worn to ensure safety when servicing hydraulic systems?
• What change should you expect in the output of a positive displacement pump as backpressure increases?
• How is output flow increased on an unbalanced vane pump?
• What is the function of hydraulic actuators?
• How can you tell if hydraulic fluid is contaminated?
• What does a hydraulic actuator do in a hydraulic system?
• Why should you check the return line filter and magnet after running a new or rebuilt motor for the first time?
• A relief valve in a hydraulic system is primarily used for?
• On which type of gear motor must you set the timing?
• What component is crucial for maintaining the timing of a vane pump?
• What is considered the most costly result of leaks in a cylinder?
• What two things should you look for to verify that you have received a motor instead of a pump?
• What is the purpose of a hydraulic system accumulator?
• What is one common application for hydraulic pumps?