AMT Hydraulics and Pneumatics Questions and Answers

Question 1

An aircraft's hydraulic system utilizes a component to ensure the landing gear doors are fully open before the landing gear begins to extend. What is this component called?

Accepted Answer

A sequence valve

Answer

A check valve

Answer

A pressure relief valve

Answer

An orifice restrictor

Question 2

Which of the following is a primary advantage of using a phosphate ester-based hydraulic fluid, such as Skydrol, over a mineral-based fluid in modern transport category aircraft?

Accepted Answer

Superior fire resistance

Answer

Lower cost and wider availability

Answer

Compatibility with natural rubber seals

Answer

Reduced toxicity and environmental impact

Question 3

A technician is servicing a hydraulic accumulator that is part of an aircraft's main hydraulic system. What is one of the primary functions of this component?

Accepted Answer

To store hydraulic fluid under pressure to supplement the pump during peak demand

Answer

To filter contaminants from the hydraulic fluid

Answer

To cool the hydraulic fluid as it returns to the reservoir

Answer

To mix air with the fluid to improve compressibility

Question 4

The fundamental principle that allows hydraulic systems to transmit and multiply force is known as:

Accepted Answer

Pascal's Law

Answer

Bernoulli's Principle

Answer

Newton's Third Law

Answer

Boyle's Law

Question 5

Compared to hydraulic systems, a primary characteristic of aircraft pneumatic systems is that they generally:

Accepted Answer

Use a compressible fluid (air or nitrogen)

Answer

Operate at much higher pressures

Answer

Provide more precise and smooth motion control

Answer

Require a return line to the reservoir

Question 6

A technician is troubleshooting a high-pressure pneumatic system. Which of the following is a significant safety hazard specifically associated with compressed air or nitrogen that is not typically a concern with hydraulic fluid?

Accepted Answer

Injection of gas into the bloodstream through a minor skin break

Answer

System contamination from moisture

Answer

The potential for fire if a leak occurs near an ignition source

Answer

Skin irritation upon contact