FREE Airframe Mechanic Hydraulic and Pneumatic Systems Questions and Answers

Question 1

An aircraft's hydraulic system includes a component that stores fluid under pressure to dampen pressure surges, supplement the system pump during peak demand, and provide an emergency source of hydraulic power.
What is this component called?

Accepted Answer

An accumulator

Answer

A pressure regulator

Answer

A sequence valve

Answer

A shuttle valve

Question 2

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

Accepted Answer

Sequence valve

Answer

Check valve

Answer

Relief valve

Answer

Selector valve

Question 3

A technician is servicing an aircraft's high-pressure pneumatic system, which is commonly used for emergency landing gear or brake operation. Which gas is typically used to service these systems due to its inert, non-flammable, and dry properties?

Accepted Answer

Nitrogen

Answer

Compressed air

Answer

Oxygen

Answer

Carbon dioxide

Question 4

Pascal's Law is a fundamental principle governing hydraulic systems. Which of the following statements best describes this law?

Accepted Answer

Pressure applied to a confined fluid is transmitted undiminished to every portion of the fluid and the walls of the containing vessel.

Answer

Fluid pressure is directly proportional to the fluid's velocity.

Answer

The force exerted by a fluid is equal to its mass times its acceleration.

Answer

For every action in a fluid system, there is an equal and opposite reaction.

Question 5

A maintenance technician is handling Skydrol, a common aviation hydraulic fluid. Which of the following is a critical characteristic of this fluid that necessitates careful handling and the use of personal protective equipment (PPE)?

Accepted Answer

It is a phosphate ester-based fluid that is extremely irritating to human tissue.

Answer

It is highly flammable at room temperature.

Answer

It is a petroleum-based fluid that is non-toxic.

Answer

It has a low viscosity and freezes at standard sea-level temperatures.

Question 6

In a pneumatic system, what is the primary purpose of a moisture separator or chemical dryer component?

Accepted Answer

To remove water vapor and prevent corrosion or freezing.

Answer

To add lubrication to the compressed air.

Answer

To increase the pressure of the system.

Answer

To cool the compressed air before it enters the system.

An aircraft's hydraulic system includes a component that stores fluid under pressure to dampen pressure surges, supplement the system pump during peak demand, and provide an emergency source of hydraulic power.What is this component called?

An aircraft's hydraulic system includes a component that stores fluid under pressure to dampen pressure surges, supplement the system pump during peak demand, and provide an emergency source of hydraulic power.
What is this component called?