INTRODUCTION OBJECTIVES - Plant Services

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132 FLUID POWER SYSTEMSTRUE/FALSET F 1. Although lobe pumps can be used in pneumatic applications, they are typically usedin hydraulic applications to move products such as slurries, pastes, and solids.T F 2. Hydraulic fixed-displacement pumps cannot vary the amount of fluid flow that theyproduce during operation without changing the speed at which they operate.T F 3. External gear pumps have two different size gears.T F 4. A balanced vane pump has an elliptical cam ring.T F 5. Displacement is the fluid flow that a pump can produce.T F 6. Axial piston pumps create smooth fluid flow for piston pumps.T F 7. Changing the angle of the swash plate in a variable-displacement piston pump does notaffect the distance of how far back a piston pulls.T F 8. Gear pumps operate through the extension and retraction of multiple pistons.T F 9. All bent-axis piston pumps are variable.T F 10. Dynamic pumps include gear, vane, and piston pumps.T F 11. Pseudocavitation can be caused by low reservoir fluid.T F 12. Gear pumps have the highest level of loudness while in operation.T F 13. Hydraulic pump schematic symbols provide direct information on pump type.T F 14. Vane pumps are typically used in applications that require the movement of high-viscosityfluids.T F 15. A radial piston pump consists of pistons located parallel to the pump shaft.T F 16. Radial piston pumps can be classified as cam or rotating piston pumps.T F 17. All hydraulic pumps have nameplates affixed to them.T F 18. The length of the piston is the main determinant to the amount of gpm that an axialpiston pump can produce.T F 19. Gear pumps are ideal for equipment that operates in dirty environments.T F 20. A bent-axis piston pump can operate at pressures above 10,000 psi.T F 21. The rotor of a variable-displacement, pressure-compensated, vane pump is centeredwith a crescent seal.T F 22. All gear pumps are fixed-displacement pumps.T F 23. Unbalanced vane pumps have the simplest design of the various types of vane pumps.T F 24. Gerotor pumps are used for high-pressure applications of greater than 1000 psi.T F 25. Positive-displacement pumps are typically classified as fixed or variable.
Chapter 4 — Hydraulic Pumps 133MATCHINGCartridge AssembliesABCDE1. Back end plate___2. Cam ring3. Front end plate4. Slotted rotor5. VaneSchematic Symbols1. Hydraulic pump—bidirectional flow—fixed-displacement2. Hydraulic pump—bidirectional flow with case drain—variable-displacement3. Electric motor4. Double-acting cylinder5. Hydraulic pump, unidirectional flow6. Internal combustion engine7. Hydraulic pump—unidirectional flow—fixed-displacement8. Hydraulic pump—unidirectional flow with case drain—variable-displacement9. Hydraulic pump—unidirectional flow with case drain—variable-displacement, pressurecompensated
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INTRODUCTION OBJECTIVES - Plant Services

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