Lesson 1 — Basic Aerodynamics Flashcards
When are the four aerodynamic forces that act on an airplane in equilibrium?
A—When the aircraft is at rest on the ground.
B—When the aircraft if accelerating.
C—During unaccelerated flight.
C
The purpose of the rudder on an airplane is to:
A—control the yaw.
B—control the overbanking tendency.
C—maintain a crab angle to correct drift.
A
The term angle of attack is defined as the
A—angle between the wing chord line and the relative wind.
B—angle between the airplane’s climb angle and the horizon
C—angle formed by the longitudinal axis of the airplane and the chord line of the wing.
A
As altitude increases, the indicated airspeed at which a given airplane stalls in a particular configuration will
A—decrease as the true airspeed increases
B—decrease as the true airspeed decreases
C—remain the same regardless of altitude
C
What causes an airplane (except a T-tail) to pitch nosedown when power is reduced and the controls are not adjusted?
A—The CG shifts forward when thrust and drag are reduced.
B—The downwash on the elevators from the propeller slipstream is reduced and elevator effectiveness is reduced.
C—When thrust is reduced to less than weight, lift is also reduced and the wings can no longer support the weight.
B
What effect does an increased load factor have on an airplane during an approach to a stall?
A—The airplane will stall at a higher airspeed.
B—The airplane will have a tendency to spin.
C—The airplane will have a tendency to yaw and roll as the stall is encountered.
A
What determines the longitudinal stability of an airplane?
A—The location of the CG with respect to the center of lift.
B—The effectiveness of the horizontal stabilizer, rudder, and rudder trim tab.
C—The relationship of thrust and lift to weight and drag.
A
The left-turning tendency of an airplane caused by P-factor is the result of the
A—clockwise rotation of the engine and the propeller turning the airplane counter-clockwise.
B—propeller blade descending on the right, producing more thrust than the ascending blade on the left.
C—gyroscopic forces applied to the rotating propeller blades acting 90º in advance of the point the force was applied
B
What is the purpose of wing flaps?
A—To enable the pilot to make steeper approaches to a landing without increasing airspeed.
B—To relieve the pilot of maintaining continuous pressure on the controls.
C—To decrease wing area to vary the lift.
A
In what flight condition is torque effect the greatest in a single-engine airplane?
A—Low airspeed, high power, high angle of attack.
B—Low airspeed, low power, low angle of attack.
C—High airspeed, high power, high angle of attack.
A
What makes an airplane turn?
A—Vertical component of lift.
B—Horizontal component of lift.
C—Centrifugal force.
B
As you maneuver an airplane you should realize that it can be stalled
A—only when the nose is high and the speed is low.
B—only when the airspeed decreases to the published stalling speed.
C—at any airspeed and in any altitude.
C
To counteract the effect of torque in a conventional single engine propeller-driven airplane, a pilot would normally add
A—left rudder pressure during the takeoff roll and while climbing with full power.
B—right rudder pressure when entering a glide from level cruising flight.
C—right rudder pressure during the takeoff roll and while climbing with full power.
C
To generate the same amount of lift as altitude in increased, an airplane must be flown at
A—the same true airspeed regardless of angle of attack.
B—a lower true airspeed and a greater angle of attack
C—a higher true airspeed for any given angle of attack
C
During a spin to the left, which wing(s) are stalled?
A—Both wings are stalled.
B—Neither wing is stalled.
C—Only the left wing is stalled.
A
