Chapter 5 Hydraulics

Fixed-displacement pumps are rated by fluid flow and ___.

• pressure rating

• speed

Hydraulic pump types include gear, vane, and ___ pumps.

• piston

• vane

___ is a localized gaseous condition within a stream of fluid that occurs when pressure is reduced to vapor pressure.

• Cavitation

• All of the above

A lobe pump requires ___ to drive the lobe-shaped driven gears.

• timing gears

• pistons

___ is the volume of hydraulic fluid moved during each revolution of the shaft of a pump.

• displacement

• Volumetric efficiency

A ___ pump has an inner rotor that meshes with the gear teeth of an outer rotor.

• gerotor

• lobe

• piston

A variable displacement pump varies the amount of hydraulic fluid with movable internal components while the ___ of the prime mover remains fixed.

• rom

• gpm

Bent-axis piston pumps are different from axial piston pumps because their ___ are at an angle (offset).

• pistons and piston blocks

• swash plates

• pistons, piston block, and swash plate

• none of the above

A(n) ___ plate is an angled plate used to extend and retract the piston in an axial piston pump.

• axial

• cylinder barrel

• piston

• swash

The main categories of hydraulic pumps are dynamic and ____ pumps.

• fixed

• nonpositive-displacement

• positive-displacement

• variable