Multiple Choice
NOTE: (Each question in this group contains one and only one correct answer. Make your choice by
circling the proper letter for each question.)
11.
The blade element located between approximately 25 and 75 percent radius is known as the auto-
rotative or driving region.
A.
This region operates at a negative angle of attack and has no effect.
B.
This region operates at a comparatively high angle of attack.
C.
This region operates at a complete stall angle of attack.
D.
This region operates at a comparatively low angle of attack.
12.
An airfoil's angle of attack is measured between the.
A.
Aircraft fuselage and the empennage group.
B.
Wing root and the wing tip.
C.
Airfoil chord and the relative wind.
D.
Angle of airfoil and the airstream.
13.
The average temperature lapse rate is:
A.
Based on the worldwide variation of temperatures with altitude.
B.
Dependent upon weather over land or sea.
C.
Measured in degrees of change per kilometer.
D.
Affected by the height of the stratosphere and time of year.
14.
Gyroscopic precession is the result of a force applied against a rotating body, and it occurs,
approximately, at a point:
A.
Two hundred and seventy degrees later in the direction of rotation from the point where
the force is applied.
B.
One hundred and twenty degrees opposite that of rotation from the point where the force
is applied.
C.
Ninety degrees later in the direction of rotation from the point where force is applied.
D.
One hundred and eighty degrees out of phase from the point where force is applied.
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AL0966
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