Hydraulics Chapter 4 Pumps

Which pump uses an impeller?

• Piston pump

• Vane pump

• Gear pump

• Non-positive-displacement pump

What pushes oil into a positive-displacement pump's inlet?

• Pilot oil

• Atmospheric Pressure

• Case pressure

• Signal pressure

Which of the following pumps requires the use of a port plate?

• Crescent

• Spur

• Helical

• Herringbone

Which of the following pumps has the most tolerance for dirt contamination?

• Gear pump

• Vane pump

• Piston pump

• All pumps have equal tolerance for contamination

Which of the following has a high volumetric efficiency?

• Gear pump

• Vane pump

• Piston pump

• All pumps have equal volumetric efficiency

Which of the following has the best mechanical efficiency?

• Gear pump

• Vane pump

• Piston pump

• All pumps pumps have equal mechanical efficiency.

Pump manufacturers will break in an external-toothed gear pump, causing which of the following?

• Cavitation

• Aeration

• Gear tracks

• Gear galling

During operation, where does the majority of oil travel in an external-toothed gear pump?

• Between the two meshing gears

• Around the outside periphery

• Both A and B

• Neither A nor B

What do vane pumps sometimes contain in order to spreed the process of rebuilding the pump?

• Port plate

• Side plate

• Cam ring

• Cartridge

Which of the following is the most popular type of piston pump found in mobile equipment?

• Rotating-cam radical piston pump

• Rotating-piston radial piston pump

• Inline axial piston pump

• Bent-axis piston pump