Propellers: DGCA Technical General questions

Question 1

Propeller efficiency is the:

Accepted Answer

Ratio of thrust horsepower to shaft horsepower.

Answer

Actual distance a propeller advances in one revolution.

Answer

Ratio of geometric pitch to effective pitch.

Answer

Ratio of TAS to RPM.

Question 2

The distance a propeller actually advances in one revolution is:

Accepted Answer

Effective pitch.

Answer

Twisting.

Answer

Geometric pitch.

Answer

Blade pitch.

Question 3

Which statement is true regarding propeller efficiency? Propeller efficiency is the:

Accepted Answer

Ratio of thrust horsepower to shaft horsepower.

Answer

Difference between the geometric pitch of the propeller and its effective pitch.

Answer

Actual distance a propeller advances in one revolution.

Answer

Ratio between the RPM and number of blade elements.

Question 4

When does asymmetric blade effect cause the aeroplane to yaw to the left?

Accepted Answer

When at high angles of attack.

Answer

When at high airspeeds.

Answer

When at low angles of attack.

Answer

In the cruise at low altitude.

Question 5

A fixed-pitch propeller is designed for best efficiency only at a given combination of:

Accepted Answer

Airspeed and RPM.

Answer

Airspeed and altitude.

Answer

Altitude and RPM.

Answer

Torque and blade angle.

12 more questions in this chapter, free with an account