AF213 FAA Practice Quiz #2

Question 1

Excluding lines, which components are required to make up a simple hydraulic system?

Answer 1

Pump, reservoir, selector valve, and actuator.

Question 2

Which statement about fluids is correct?

Answer 2

All fluids readily transmit pressure.

Question 3

(1) Materials which are Skydrol compatible or resistant include most common aircraft metals and polyurethane and epoxy paints. (2) Skydrol hydraulic fluid is compatible with nylon and natural fibers. Regarding the above statements,

Answer 3

both No. 1 and No. 2 are true.

Question 4

Which is a characteristic of synthetic base hydraulic fluid?

Answer 4

High flash point.

Question 5

If an engine-driven hydraulic pump of the correct capacity fails to maintain normal system pressure during the operation of a cowl flap actuating unit, the probable cause is

Answer 5

restriction in the pump outlet.

Question 6

Where can information be obtained about the compatibility of fire-resistant hydraulic fluid with aircraft materials?

Answer 6

Fluid manufacturer’s technical bulletins.

Question 7

Which is a characteristic of petroleum base hydraulic fluid?

Answer 7

Flammable under normal conditions.

Question 8

Chattering of the hydraulic pump during operation is an indication

Answer 8

that air is entering the pump.

Question 9

Which seals are used with petroleum base hydraulic fluids?

Answer 9

Buna-N.

Question 10

Quick-disconnect couplings in hydraulic systems provide a means of

Answer 10

quickly connecting and disconnecting hydraulic lines without loss of fluid or entrance of air into the system.

Question 11

Many hydraulic reservoirs contain a small quantity of fluid which is not available to the main system pump. This fluid is retained tor

Answer 11

supply fluid to the auxiliary pump.

Question 12

If fluid is added to a reservoir in a constant pressure hydraulic system while the system is pressurized, what will result?

Answer 12

The fluid level will increase when system pressure is reduced.

Question 13

What is one advantage of piston-type hydraulic motors over electric motors?

Answer 13

There is no fire hazard if the motor is stalled.

Question 14

The purpose of the pressure regulator in a hydraulic system is to

Answer 14

maintain system operating pressure within a predetermined range and to unload the pump.

Question 15

Characteristics of MIL-H-7644 hydraulic fluid are

Answer 15

blue color, vegetable base, will burn, natural rubber seals.

Question 16

Hydraulic system accumulators serve which of the following functions? 1. Dampen pressure surges. 2. Supplement the system pump when demand is beyond the pump’s capacity. 3. Store power for limited operation of components if the pump is not operating. 4. Ensure a continuous supply of fluid to the pump.

Answer 16

1, 2, 3.

Question 17

To protect seals from damage when installed over a threaded section, the threaded section should be

Answer 17

covered with a suitable sleeve.