AF213 FAA Practice Quiz #1

Question 1

Which seals are used with petroleum base hydraulic fluids?

Answer 1

Buna-N

Question 2

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

Answer 2

Fluid manufacturer’s technical bulletins.

Question 3

Pressure is a term used to indicate the force per unit area. Pressure is usually expressed in

Answer 3

pounds per square inch.

Question 4

Seals used with a mineral base hydraulic fluid are identified by which color code?

Answer 4

Blue dot or stripe.

Question 5

If a rigid tube is too short for the flare to reach its seat before tightening, pulling it into place by tightening

Answer 5

may distort the flare.

Question 6

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 6

1, 2, 3.

Question 7

Pneumatic systems utilize

Answer 7

relief valves.

Question 8

In a gear-type hydraulic pump, a mechanical safety device incorporated to protect the pump from overload is the

Answer 8

shear pin

Question 9

Which must be done before adjusting the relief valve of a main hydraulic system incorporating a pressure regulator?

Answer 9

Eliminate the action of the unloading valve.

Question 10

Generally, the first step in removing an accumulator from an aircraft is to

Answer 10

relieve system pressure.

Question 11

(1) When servicing aircraft hydraulic systems, use the type fluid specified in the aircraft manufacturer’s maintenance manual or on the instruction plate affixed to the reservoir or unit. (2) Hydraulic fluids for aircraft are dyed a specific color for each type of fluid. Regarding the above statements,

Answer 11

both No. 1 and No. 2 are true.

Question 12

One of the main advantages of skydrol is its

Answer 12

wide operating temperature.

Question 13

Which is true regarding the ground check of a flap operating mechanism which has just been installed?

Answer 13

If the time required to operate the mechanism decreases with successive operations, it indicates the air is being worked out of the system.

Question 14

After installation of a rebuilt hydraulic hand pump, it is found that the handle cannot be moved in the pumping direction (pressure stroke). The most likely cause is an incorrectly installed

Answer 14

hand pump outport check valve.

Question 15

Which of the following lists only desirable properties of a good hydraulic fluid that has chemical stability?

Answer 15

Low viscosity, high flash point, high fire point.

Question 16

The internal resistance of a fluid which tends to prevent it from flowing is called

Answer 16

Viscosity.

Question 17

A flexible sealing element subject to motion is a

Answer 17

Packing.