11 Aviation: ADY 3

The four forces acting on an airplane in flight are

• lift, weight, thrust, and drag.

• lift, weight, gravity, and thrust.

• lift, gravity, power, and friction.

The term 'angle of attack' is defined as the angle

• between the wing chord line and the relative wind.

• between the airplane's climb angle and the horizon.

• formed by the longitudinal axis of the airplane and the chord line of the wing.

What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?

• Lift equals weight and thrust equals drag.

• Lift, drag, and weight equal thrust.

• Lift and weight equal thrust and drag.

An airplane said to be inherently stable will

• be difficult to stall.

• require less effort to control.

• not spin.

What determines the longitudinal stability of an airplane?

• The location of the CG with respect to the center of lift.

• The effectiveness of the horizontal stabilizer, rudder, and rudder trim tab.

• The relationship of thrust and lift to weight and drag.

What causes an airplane (except a T-tail) to pitch nosedown when power is reduced and controls are not adjusted?

• The CG shifts forward when thrust and drag are reduced.

• The downwash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced.

• When thrust is reduced to less than weight, lift is also reduced and the wings can no longer support the weight.

Which statement relates to Bernoulli`s principle?

• For every action there is an equal and opposite reaction.

• An additional upward force is generated as the lower surface of the wing deflects air downward.

• Air traveling faster over the curved upper surface of an airfoil causes lower pressure on the top surface.

The amount of excess load that can be imposed on the wing of an airplane depends upon the

• position of the CG.

• speed of the airplane.

• abruptness at which the load is applied.

Which basic flight maneuver increases the load factor on an airplane as compared to straight-and-level flight?

• Climbs.

• Turns.

• Stalls.

One of the main functions of flaps during approach and landing is to

• decrease the angle of descent without increasing the airspeed.

• permit a touchdown at a higher indicated airspeed.

• increase the angle of descent without increasing the airspeed.