Piston Engines - Propellers: DGCA Technical General questions

Question 1

[Propellers] The alpha range of a variable pitch propeller is between:

Accepted Answer

Feather and flight fine pitch stop.

Answer

Feather and ground fine pitch stop.

Answer

Flight fine pitch stop and reverse stop.

Answer

Ground fine pitch and reverse stop.

Question 2

[Propellers] The Beta range of a propeller is from:

Accepted Answer

The flight fine pitch stop to the reverse pitch stop.

Answer

The feather stops to the flight fine pitch stop.

Answer

The feather stops to the ground fine pitch stop.

Answer

The feather stops to the reverse pitch stop.

Question 3

[Propellers] Propellers may have an 'avoid' range of rpm:

Accepted Answer

To avoid resonance peaks which could lead to fatigue damage to the propeller.

Answer

To avoid excessive propeller noise.

Answer

Because the engine does not run efficiently in that rpm range.

Answer

To avoid the possibility of detonation occurring in the engine.

Question 4

[Propellers] The CSU incorporates an oil pump. Its purpose is:

Accepted Answer

To increase the engine oil pressure to a higher pressure to operate the propeller pitch change mechanism.

Answer

To provide pressure to feather the propeller.

Answer

To provide pressure to unfeather the propeller.

Answer

To ensure adequate lubrication of the CSU.

Question 5

[Propellers] Propeller torque results from the forces on the propeller:

Accepted Answer

Caused by the airflow, giving a moment around the aircraft's longitudinal axis.

Answer

Caused by the airflow, giving a moment around the propeller's longitudinal axis.

Answer

Caused by centrifugal effect, giving a moment around the propeller's longitudinal axis.

Answer

Caused by centrifugal effect, giving a moment around the aircraft's longitudinal axis.

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