Airplanes and Aerodynamics Quiz # 1

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1.	What is one purpose of wing flaps?

	A. To enable the pilot to make steeper approaches to a landing without increasing the airspeed.
	B. to relieve the pilot of maintaining continuous pressure on the controls.
	C. To decrease wing area to vary the lift.

2.	The four forces acting on an airplane in flight are

	A. lift, weight, thrust, drag.
	B. lift, weight, gravity, and thrust.
	C. lift, gravity, power, and friction.

3.	When are the four forces that act on an airplane in equilibrium?

	A. During unaccelerated flight.
	B. When the aircraft is accelerating.
	C. When the aircraft is at rest on the ground.

4.	The term "angle of attack" is defined as the angle

	A. between the wing chord line and the relative wind.
	B. between the airplane's climb angle and the horizon.
	C. formed by the longitudinal axis of the airplane and the chord line of the wing.

5.	What force makes an airplane turn?

	A. The horizontal component of lift.
	B. The vertical component of lift.
	C. Centrifugal force.

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