MODULE 12 - Helicopter Aerodynamics, Structures & Systems

12.01, Theory of Flight - Rotary Wing Aerodynamics.
Question Number.  1.  The angle of attack of a blade is the. 
Option A.  angle between the chord line and plane of rotation.
Option B.  angle between the spin axis and relative air flow.
Option C.  angle between the chord line and relative airflow.
Correct Answer is.  angle between the chord line and relative airflow.


Explanation.  NIL.

Question Number.  2.  Lift generated by a blade is proportional to the. 
Option A.  relative airflow and the pitch.
Option B.  relative airflow and the angle of attack.
Option C.  blade speed and angle of attack.
Correct Answer is.  relative airflow and the angle of attack.

Explanation.  NIL.

Question Number.  3.  With the helicopter in forward flight, parasitic drag will cause the helicopter to. 
Option A.  pitch nose down with a decrease in forward airspeed.
Option B.  pitch nose down with an increase in forward airspeed.
Option C.  pitch nose up with an increase in forward in airspeed.
Correct Answer is.  pitch nose down with an increase in forward airspeed.
Explanation.  NIL.
Question Number.  4.  When a blade moves about the flapping hinge. 
Option A.  the drag forces on the blade change and the angle of attack (AOA) changes. 
Option B.  the pitch angle of the blade always reduces.
Option C.  the drag forces on the blade change.
Correct Answer is.  the drag forces on the blade change and the angle of attack (AOA) changes.
Explanation.  NIL.
Question Number.  5.  To maintain the position of the helicopter with a decrease in air density, the pilot must increase.
Option A.   main rotor RPM.
Option B.  cyclic pitch.
Option C.  collective pitch.
Correct Answer is.  collective pitch.
Explanation.  NIL.

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12.01, Theory of Flight - Rotary Wing Aerodynamics.
Question Number.  1.  The angle of attack of a blade is the. 
Option A.  angle between the chord line and plane of rotation.
Option B.  angle between the spin axis and relative air flow.
Option C.  angle between the chord line and relative airflow.
Correct Answer is.  angle between the chord line and relative airflow.


Explanation.  NIL.

Question Number.  2.  Lift generated by a blade is proportional to the. 
Option A.  relative airflow and the pitch.
Option B.  relative airflow and the angle of attack.
Option C.  blade speed and angle of attack.
Correct Answer is.  relative airflow and the angle of attack.

Explanation.  NIL.

Question Number.  3.  With the helicopter in forward flight, parasitic drag will cause the helicopter to. 
Option A.  pitch nose down with a decrease in forward airspeed.
Option B.  pitch nose down with an increase in forward airspeed.
Option C.  pitch nose up with an increase in forward in airspeed.
Correct Answer is.  pitch nose down with an increase in forward airspeed.
Explanation.  NIL.
Question Number.  4.  When a blade moves about the flapping hinge. 
Option A.  the drag forces on the blade change and the angle of attack (AOA) changes. 
Option B.  the pitch angle of the blade always reduces.
Option C.  the drag forces on the blade change.
Correct Answer is.  the drag forces on the blade change and the angle of attack (AOA) changes.
Explanation.  NIL.
Question Number.  5.  To maintain the position of the helicopter with a decrease in air density, the pilot must increase.
Option A.   main rotor RPM.
Option B.  cyclic pitch.
Option C.  collective pitch.
Correct Answer is.  collective pitch.
Explanation.  NIL.

LINK DOWNLOAD

Chuyên mục: C. Bài giảng C. Bài giảng chuyên ngành Cơ khí - Chế tạo máy (Mechanical & Manufacturing Engineering) C. Bài giảng kỹ thuật