AMT AMT Hydraulics, Pneumatics & Landing Gear

Question 1

What principle states that pressure applied to an enclosed fluid is transmitted equally in all directions?

Accepted Answer

Pascal's law

Answer

Bernoulli's principle

Answer

Boyle's law

Answer

Newton's third law

Question 2

Which type of hydraulic fluid is most commonly used in modern commercial transport aircraft in the US?

Accepted Answer

Skydrol (phosphate ester-based)

Answer

Mineral-based (MIL-H-5606)

Answer

Vegetable-based fluid

Answer

Water-glycol mixture

Question 3

What is the primary function of an aircraft hydraulic accumulator?

Accepted Answer

To store pressurized fluid and dampen pressure surges

Answer

To filter hydraulic fluid

Answer

To convert hydraulic pressure to electrical power

Answer

To cool hydraulic fluid

Question 4

What safety precaution must be taken before opening any hydraulic line on an aircraft?

Accepted Answer

Depressurize the hydraulic system completely

Answer

Increase system pressure to purge contaminants

Answer

Run the hydraulic pump at full speed

Answer

Drain only the reservoir

Question 5

What does a hydraulic system relief valve do?

Accepted Answer

Limits maximum system pressure by bypassing fluid back to the reservoir

Answer

Increases system pressure when demand is high

Answer

Filters contaminants from the fluid

Answer

Controls flow direction to actuators

Question 6

What color is MIL-H-5606 mineral-based hydraulic fluid used in some general aviation aircraft?

Accepted Answer

Red

Answer

Blue

Answer

Clear

Answer

Green