FREE A&P Hydraulic and Pneumatic Systems Questions and Answers

Question 1

An aircraft's hydraulic system is equipped with an accumulator. What is a primary function of this component?

Accepted Answer

To store fluid under pressure to supplement the pump and absorb pressure surges.

Answer

To filter contaminants from the hydraulic fluid.

Answer

To cool the hydraulic fluid after it passes through the pump.

Answer

To increase the system pressure above the normal operating pressure for emergency use.

Question 2

During a landing gear retraction sequence, the landing gear doors must open fully before the gear begins to retract. Which type of valve is specifically designed to control the sequence of operations between two branches of a hydraulic circuit?

Accepted Answer

Sequence valve

Answer

Shuttle valve

Answer

Check valve

Answer

Priority valve

Question 3

A technician needs to service a large transport category aircraft's hydraulic system which is known to use a phosphate ester-based fluid. Which of the following fluids should be used?

Accepted Answer

Skydrol

Answer

MIL-H-5606

Answer

MIL-H-83282

Answer

MIL-H-6083

Question 4

While inspecting a brake system hydraulic line, a technician notices a component designed to automatically shut off fluid flow in the event of a sudden, high-rate leak, such as a ruptured line. What is this safety device called?

Accepted Answer

A hydraulic fuse

Answer

A pressure relief valve

Answer

An orifice check valve

Answer

A system bypass valve

Question 5

In many turbine-powered aircraft, the pneumatic system that provides compressed air for air conditioning, pressurization, and anti-icing systems primarily obtains this air from:

Accepted Answer

The engine compressor section (bleed air)

Answer

Engine-driven vacuum pumps

Answer

Electrically powered air compressors

Answer

Ram air scoops connected to storage tanks

Question 6

Which of the following is a critical maintenance step for pneumatic de-icing boots to ensure their longevity and proper operation?

Accepted Answer

Regularly cleaning them with approved agents and applying a rubber preservative.

Answer

Applying a thick layer of grease to prevent cracking.

Answer

Inflating them to maximum pressure for 24 hours annually to check for leaks.

Answer

Painting them with standard aircraft paint to protect against UV radiation.