FREE Airframe Mechanic Hydraulic & Pneumatic Systems Questions and Answers

Question 1

Which component in a hydraulic system converts fluid pressure into mechanical force or motion?

Accepted Answer

Actuator

Answer

Reservoir

Answer

Accumulator

Answer

Selector valve

Question 2

A technician observes that the hydraulic system pressure gauge indicates zero, even though the pump is running and the reservoir is full. The most likely cause, assuming no external leaks, would be a malfunction in which of the following components?

Accepted Answer

A relief valve stuck open

Answer

A clogged return line filter

Answer

An over-pressurized accumulator

Answer

A faulty hydraulic motor

Question 3

In a pneumatic system, what is the primary function of a dessicant dryer?

Accepted Answer

To remove moisture from the compressed air

Answer

To increase air pressure

Answer

To lubricate moving parts

Answer

To filter out particulate contaminants

Question 4

When troubleshooting a sluggish hydraulic landing gear retraction, a technician should first check for proper operation of which of the following?

Accepted Answer

The hydraulic pump output and system pressure

Answer

The landing gear downlock mechanism

Answer

The brake master cylinder fluid level

Answer

The nose wheel steering actuator

Question 5

Which type of valve in a hydraulic system is used to prevent fluid flow in one direction while allowing free flow in the opposite direction?

Accepted Answer

Check valve

Answer

Selector valve

Answer

Sequence valve

Answer

Pressure reducer

Question 6

A pneumatic system includes a pressure regulator. What is its primary role?

Accepted Answer

To reduce and maintain a constant output pressure regardless of input fluctuations

Answer

To store compressed air for peak demands

Answer

To remove oil and water from the air

Answer

To convert pneumatic energy into mechanical motion