Hydraulic And Pneumatic Power Systems

Question 1

The primary purpose of a hydraulic actuating unit is to transform

Answer 1

fluid pressure into useful work.

Question 2

If an aircraft hydraulic system requires mineral base hydraulic fluid, but phosphate ester base hydraulic fluid is used, what will be the effect on the system?

Answer 2

System will be contaminated, fluids will not blend, and the seals will fail.

Question 3

Chattering of the hydraulic pump during operation is an indication

Answer 3

that air is entering the pump

Question 4

Components containing phosphate ester-base hydraulic fluid may be cleaned with

Answer 4

Stoddard solvent.

Question 5

If it is necessary to adjust several pressure regulating valves in a hydraulic system, what particular sequence, if any, should be followed?

Answer 5

Units with the highest pressure settings are adjusted first.

Question 6

Hydraulic fluid filtering elements constructed of porous paper are normally

Answer 6

discarded at regular intervals and replaced with new filtering elements.

Question 7

Which is a characteristic of petroleum base hydraulic fluid?

Answer 7

Flammable under normal conditions.

Question 8

Unloading valves are used with many engine-driven hydraulic pumps to

Answer 8

relieve the pump pressure

Question 9

Some hydraulic systems incorporate a device which is designed to remain open to allow a normal fluid flow in the line, but closed if the fluid flow increases above an established rate. This device is generally referred to as a

Answer 9

Hydraulic Fuse