Aircraft Aerodynamics Practice Questions PDF

## Multiple Choice Questions 1. The auxiliary (tail) rotor of a helicopter permits the pilot to compensate for and/or accomplish which of the following? * a. Attitude and airspeed. * b. Lateral and yaw position. * c. Torque and directional control. 2. The vertical flight of a h...

## Multiple Choice Questions 1. The auxiliary (tail) rotor of a helicopter permits the pilot to compensate for and/or accomplish which of the following? * a. Attitude and airspeed. * b. Lateral and yaw position. * c. Torque and directional control. 2. The vertical flight of a helicopter is controlled by * a. collective pitch changes. * b. cyclic pitch changes. (CHANGES' IN HORIZONTAL PLANER) * c. increasing or decreasing the RPM of the main rotor. 3. A reduction in anti-torque thrust will cause the * a. tail to pivot in the opposite direction of torque rotation around the main rotor. * b. tail to pivot in the direction of torque rotation around the main rotor axis. * c. anti-torque system to become more efficient in the hover mode. 4. In rotorcraft external-loading, the ideal location of the cargo release is where the line of action passes * a. aft of the center of gravity at all times. * b. forward of the center of gravity at all times. * c. through the center of gravity at all times. 5. The acute angle formed by the chord line of a wing and the relative wind is known as the * a. longitudinal dihedral angle. * b. angle of incidence. * c. angle of attack. 6. A helicopter in forward flight, cruise configuration, changes direction by * a. varying the pitch of the main rotor blades. * b. changing rotor RPM. * c. tilting the main rotor disk in the desired direction. 7. The purpose in checking main rotor blade tracking is to determine the * a. relative position of the blades during rotation. * b. flight path of the blades during rotation. * c. extent of an out of balance condition during rotation. 8. In a hovering helicopter equipped with a tail rotor, directional control is maintained by * a. changing the tail rotor RPM. * b. tilting the main rotor disk in the desired direction. FORWARD BACKWARDS, OR SIDEWAYS * c. varying the pitch of the tail rotor blades. 9. If a single-rotor helicopter is in forward horizontal flight, the angle of attack of the advancing blade is * a. more than the retreating blade. * b. equal to the retreating blade. * c. less than the retreating blade. 10. Main rotor blades that do not cone by the same amount during rotation are said to be out of * a. balance. * b. collective pitch. * c. track. 11. One purpose of the freewheeling unit required between the engine and the helicopter transmission is to * a. automatically disengage the rotor from the engine in case of an engine failure. * b. disconnect the rotor from the engine to relieve the starter load. * c. permit practice of autorotation landings. 12. Which statement is correct concerning torque effect on helicopters? * a. Torque direction is the same as rotor blade rotation. * b. As horsepower decreases, torque increases. * c. Torque direction is the opposite of rotor blade rotation. 13. What is the purpose of the free-wheeling unit in a helicopter drive system? * a. It disconnects the rotor whenever the engine stops or slows below the equivalent of rotor RPM. * b. It releases the rotor brake for starting. * c. It relieves bending stress on the rotor blades during starting. 14. Movement about the longitudinal axis (roll) in a helicopter is effected by movement of the * a. collective pitch control. * b. cyclic pitch control. * c. tail rotor pitch control. 15. Movement about the lateral axis (pitch) in a helicopter is effected by movement of the * a. collective pitch control. * b. cyclic pitch control. * c. tail rotor pitch control. 16. Wing dihedral, a rigging consideration on most airplanes of conventional design, contributes most to stability of the airplane about its * a. longitudinal axis. * b. vertical axis. * c. lateral axis. 17. Other than the manufacturer maintenance manual what other document could be used to determine the primary flight control surface deflection for an imported aircraft that is reassembled after shipment? * a. Aircraft type certificate data sheet. * b. Import manual for the aircraft. * c. The certificate of airworthiness issued by the importing country. 18. If a pilot reports that an airplane flies left wing heavy, this condition may be corrected by * a. increasing the angle of incidence of the left wing, or decreasing the angle of incidence of the right wing, or both. * b. increasing the dihedral angle of the left wing, or decreasing the dihedral angle of the right wing, or both. * c. adjusting the dihedral angle of the left wing so that differential pressure between the upper and lower wing surfaces is increased. 19. If the vertical fin of a single-engine, propeller-driven airplane is rigged properly, it will generally be parallel to * a. the longitudinal axis but not the vertical axis. * b. the vertical axis but not the longitudinal axis. * c. both the longitudinal and vertical axes. 20. An airplane which has good longitudinal stability should have a minimum tendency to * a. roll. * b. pitch. * c. yaw. 21. As the angle of attack of an airfoil increases, the center of pressure will * a. move toward the trailing edge. * b. remain stationary because both lift and drag components increase proportionally to increased angle of attack. * c. move toward the leading edge. 22. The angle of incidence is that acute angle formed by * a. the angular difference between the setting of the main airfoil and the auxiliary airfoil (horizontal stabilizer) in reference to the longitudinal axis of the aircraft. * b. a line parallel to the wing chord and a line parallel to the longitudinal axis of the aircraft. * c. a line parallel to the wing from root to tip and a line parallel to the lateral axis of the aircraft. 23. An airplane's center of lift is usually located aft of its center of gravity * a. so that the airplane will have a tail-heavy tendency. * b. so that the airplane will have a nose-heavy tendency. * c. to improve stability about the longitudinal axis. 24. An airplane is controlled directionally about its vertical axis by the * a. rudder. * b. elevator(s). * c. ailerons. 25. The elevators of a conventional airplane are used to provide rotation about the * a. longitudinal axis. * b. lateral axis. * c. vertical axis. 26. Washing-in the left wing of a monoplane, for purposes of rigging corrections after flight test, will have what effect on the lift and drag of that wing? * a. Both drag and lift will decrease due to decreased angle of attack. * b. Both drag and lift will increase due to increased angle of attack. * c. The drag will decrease due to the effect of the lift increase. 27. What type of flap system increases the wing area and changes the wing camber? * a. Fowler flaps. * b. Slotted flaps. * c. Split flaps. 28. If the right wing of a monoplane is improperly rigged to a greater angle of incidence than designated in the manufacturer's specifications, it will cause the * a. airplane to be off balance both laterally and directionally. * b. airplane to pitch and roll about the lateral axis. * c. right wing to have both an increased lift and a decreased drag. 29. The chord of a wing is measured from * a. wingtip to wingtip. * b. wing root to the wingtip. * c. leading edge to trailing edge. 30. When the lift of an airfoil increases, the drag will * a. decrease. * b. also increase. * c. increase while the lift is changing but will return to its original value.