Free SIFT Army Aviation Information Questions and Answers 1

Question 1

A thrust is produced by

Accepted Answer

The engine(s) of a helicopter

Answer

Thrust is the force that propels an aircraft. In a helicopter, the engine(s) are responsible for generating the power that drives the main rotor system. It is the rotation of these main rotor blades, powered by the engine(s), that creates the aerodynamic forces, including both lift and thrust, necessary for flight.

Question 2

Which of the following does not refer to a typical helicopter control?

Accepted Answer

Dual

Answer

The primary flight controls of a helicopter are the collective, which changes the pitch of all main rotor blades simultaneously to control altitude; the cyclic, which changes the pitch of individual blades cyclically to control direction; and the anti-torque pedals (or tail rotor control), which control yaw. 'Dual' is not a standard flight control component.

Question 3

Which of the subsequent is not a typical helicopter taxi maneuver?

Accepted Answer

Rotor Taxi

Answer

Standard helicopter taxi maneuvers include Ground Taxi (moving on wheels), Hover Taxi (moving slowly above the ground, typically below 20 knots and 20 feet AGL), and Air Taxi (moving faster and/or higher than a hover taxi, but still below normal cruising flight). 'Rotor Taxi' is not a recognized or typical term for a helicopter taxi maneuver.

Question 4

During takeoff, blade flapping is utilized to:

Accepted Answer

Counter dissymmetry of lift

Answer

During forward flight, the advancing rotor blade (moving in the direction of flight) experiences higher airspeed and thus more lift than the retreating blade. This phenomenon is called dissymmetry of lift. Blade flapping, where the blades move up and down, is a crucial mechanism that allows the rotor system to equalize lift across the rotor disc, thereby countering dissymmetry of lift and maintaining stable flight.

Question 5

Another name for settling with power is

Accepted Answer

Vortex ring state

Answer

Settling with power is a dangerous aerodynamic condition where a helicopter descends into its own downwash, causing the rotor blades to operate in turbulent air that has already passed through the rotor. This leads to a significant loss of lift and control, even with power applied. This condition is also commonly known as a vortex ring state.

SIFT Exam Practice Test

SIFT Exam Practice Test

Free SIFT Army Aviation Information Questions and Answers 1