Propeller Practice Questions

Module 17, Propeller.

17.1. Fundamentals.

Question Number. 1. High speed propellers are designed to.

Option A. rotate at high RPM.

Option B. operate at high forward speeds.

Option C. operate at supersonic tip speeds.

Correct Answer is. operate at high forward speeds.

Explanation. NIL.

Question Number. 2. When in the windmill position ATM.

Option A. opposes CTM.

Option B. is not related to CTM.

Option C. assists CTM.

Correct Answer is. assists CTM.

Explanation. ATM normally increases blade angle but in the windmill condition reverses and assists CTM.

Question Number. 3. The optimum angle for a fixed pitch propeller is.

Option A. 15 degrees.

Option B. 2 - 4 degrees.

Option C. 6 - 10 degrees.

Correct Answer is. 2 - 4 degrees.

Explanation. Jepperson A&P Powerplant Page 12-4 Refers.

Question Number. 4. A left handed propeller is one that.

Option A. rotates clockwise when viewed from the rear.

Option B. rotates clockwise when viewed from the front.

Option C. is fitted to an engine on the left side of the aircraft.

Correct Answer is. rotates clockwise when viewed from the front.

Explanation. Left hand propeller rotates anti-clockwise when viewed from the rear. http://www.baypropeller.com/parts.html

Question Number. 5. Forces acting on a propeller are.

Option A. centrifugal, twisting, and bending.

Option B. torque, thrust and centrifugal.

Option C. torsion, tension and thrust.

Correct Answer is. centrifugal, twisting, and bending.

Explanation. Jepperson Powerplant Page 12-5 to 12-7 refers.

Question Number. 6. The blade angle at the root is.

Option A. less than the tip.

Option B. same from tip to root.

Option C. greater than the tip.

Correct Answer is. greater than the tip.

Explanation. Jepperson Aircraft Propellers and Controls Page 13 Refers.

Question Number. 7. What force on a propeller blade turns the blades to a fine pitch?.

Option A. ATM.

Option B. Torque.

Option C. CTM.

Correct Answer is. CTM.

Explanation. Jepperson Aircraft Propellers and Controls Page 15 refers.

Question Number. 8. The purpose of propeller twist is.

Option A. coarsen the blade angle at the root.

Option B. to maintain Blade Angle along the blade.

Option C. to maintain Angle of Attack at the same value along the blade.

Correct Answer is. to maintain Angle of Attack at the same value along the blade.

Explanation. Jepperson Aircraft Propellers and Controls Page 13 Refers.

Question Number. 9. The forces acting on a propeller blade are.

Option A. bending, twisting and centrifugal.

Option B. thrust, aerodynamic and tension.

Option C. thrust and torque.

Correct Answer is. bending, twisting and centrifugal.

Explanation. Refer Jepperson Powerplant Page 12- 5 to 7.

Question Number. 10. Blade angle at the root is.

Option A. low.

Option B. high.

Option C. master blade angle.

Correct Answer is. high.

Explanation. Jepperson Aircraft Propellers and Control Pages 55-58 Refer.

Question Number. 11. Blade angle is taken from the chord and.

Option A. propeller shaft.

Option B. relative airflow.

Option C. plane of rotation.

Correct Answer is. plane of rotation.

Explanation. Jepperson Aircraft Propellers and Control Page132 refer.

Question Number. 12. What forces act on a propeller blade?.

Option A. Thrust and torque.

Option B. Bending, thrust, torque.

Option C. Bending, CTM and ATM.

Correct Answer is. Bending, CTM and ATM.

Explanation. Refer Jepperson Aircraft Propellers and Controls Page 14-15 Note Thrust and Torque are both.

Question Number. 13. CTM will.

Option A. try to bend the blade away from the engine.

Option B. turn the blade about the lateral axis.

Option C. cause the tips to rotate at supersonic speeds.

Correct Answer is. turn the blade about the lateral axis.

Explanation. Jepperson Aircraft Propellers and Controls page Page 15 refers.

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