FREE AMT Aircraft Propeller Systems Questions and Answers

Question 1

In a constant-speed propeller governor, what is the primary function of the flyweights?

Accepted Answer

To sense engine RPM and control the position of the pilot valve.

Answer

To directly change the propeller blade angle.

Answer

To provide the oil pressure needed for pitch changes.

Answer

To set the desired RPM as selected by the pilot.

Question 2

What is the primary reason for feathering the propeller of a failed engine on a multi-engine aircraft?

Accepted Answer

To align the blades with the relative wind to minimize aerodynamic drag.

Answer

To allow the propeller to windmill, providing electrical power.

Answer

To increase the blade pitch to the highest possible angle for maximum braking.

Answer

To move the blades to a low pitch setting for an easier in-flight restart.

Question 3

During takeoff in an aircraft with a constant-speed propeller, the propeller blade pitch is set to:

Accepted Answer

A low pitch, high RPM position to allow the engine to develop maximum power.

Answer

A high pitch, low RPM position to take a large bite of air.

Answer

The feathered position to reduce initial engine load.

Answer

An intermediate pitch that is averaged between climb and cruise settings.

Question 4

A pilot reports that after an in-flight engine shutdown on a multi-engine aircraft, the propeller failed to feather and continued to windmill. Which of the following is a plausible mechanical reason for this failure?

Accepted Answer

The centrifugal 'stop pins' engaged because the engine RPM dropped too low before feathering was initiated.

Answer

The governor speeder spring tension was set too high.

Answer

The propeller synchronization system was left on.

Answer

Centrifugal latch pins failed to retract due to high RPM.

Question 5

Which of the following describes the function of a propeller synchronization system on a multi-engine aircraft?

Accepted Answer

It adjusts the RPM of the 'slave' engine(s) to exactly match the RPM of the 'master' engine.

Answer

It ensures all propeller blades are at the exact same pitch angle.

Answer

It automatically feathers all propellers in the event of a dual engine failure.

Answer

It reverses the pitch of all propellers simultaneously for braking after landing.

Question 6

A propeller is equipped with electrically heated de-ice boots on the leading edges of the blades. How does this system typically operate to remove ice?

Accepted Answer

The boots are heated in a repeating cycle, melting the layer of ice closest to the blade so it can be thrown off by centrifugal force.

Answer

The boots are continuously heated to a high temperature to prevent any ice from ever forming.

Answer

A chemical de-icing fluid is secreted through small pores in the heated boots.

Answer

High-frequency vibrations are induced in the boots to shatter the accumulated ice.