17.1.6

NOTE

TO CHECK YOUR PREPARATION ,PLZ WRITE DOWN THE SELECTED OPTIONS ON ROUGH PAGE AND  AT THE END OF QUIZ , VERIFY YOUR SELECTED OPTION WITH THE CORRECT OPTIONS GIVEN BELOW 

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Question number. 41. The chord line of a propeller is.

Option a. A line joining the leading and trailing edges.

Option b. A line joining the tip to the root of the blade.

Option c. A line joining the tips of the blades.

Question number. 42. The plane of rotation is defined as.

Option a. The plane in which thrust force acts.

Option b. The plane in which the propeller rotates.

 Option c. The angle at which the blade strikes the airflow.

Question number. 43. Thrust bending force on a propeller blade.

Option a. Intensifies the centrifugal forces to some degrees.

Option b. Can be used in propeller design to reduce some operation stress.

Option c. Tends to bend the propeller blade forward at the tip.

 Question number. 44. What conditions are applied to a propeller blade windmilling?

Option a. Positive angle of attack, thrust negative.

Option b. Negative angle of attack, thrust positive.

Option c. Negative angle of attack, thrust negative.

Question number. 45. The primary purpose of propeller is to.

Option a. Change engine horsepower to thrust.

 Option b. Provide static and dynamic stability to aircraft.

Option c. Create lift on the fixed aerofoils of an aircraft.

Question number. 46. The primary purpose of a feathering propeller is to.

Option a. Prevent further engine damage when an engine fails in flight.

Option b. Prevent propeller damage when an engine fails in flight.

 Option c. Eliminate the drag created by a windmilling propeller when an engine fails in flight.

ABOVE QUESTION WITH ANSWERS 

Question number. 41. The chord line of a propeller is.

Option a. A line joining the leading and trailing edges.

Option b. A line joining the tip to the root of the blade.

Option c. A line joining the tips of the blades.

Correct answer is. A line joining the leading and trailing edges.

Question number. 42. The plane of rotation is defined as.

Option a. The plane in which thrust force acts.

Option b. The plane in which the propeller rotates.

 Option c. The angle at which the blade strikes the airflow.

Correct answer is. The plane in which the propeller rotates.

Question number. 43. Thrust bending force on a propeller blade.

Option a. Intensifies the centrifugal forces to some degrees.

Option b. Can be used in propeller design to reduce some operation stress.

Option c. Tends to bend the propeller blade forward at the tip.

Correct answer is. Tends to bend the propeller blade forward at the tip.

 Question number. 44. What conditions are applied to a propeller blade windmilling?

Option a. Positive angle of attack, thrust negative.

Option b. Negative angle of attack, thrust positive.

Option c. Negative angle of attack, thrust negative.

Correct answer is. Negative angle of attack, thrust negative.

Question number. 45. The primary purpose of propeller is to.

Option a. Change engine horsepower to thrust.

 Option b. Provide static and dynamic stability to aircraft.

Option c. Create lift on the fixed aerofoils of an aircraft.

Correct answer is. Change engine horsepower to thrust.

Question number. 46. The primary purpose of a feathering propeller is to.

Option a. Prevent further engine damage when an engine fails in flight.

Option b. Prevent propeller damage when an engine fails in flight.

 Option c. Eliminate the drag created by a windmilling propeller when an engine fails in flight.

 Correct answer is. Eliminate the drag created by a windmilling propeller when an engine fails in flight.