SIFT (Army Aviation)questions with complete solution 2023

SIFT (Army Aviation)Profile drag - correct answer Caused by the blades frictional resistance Induced drag - correct answer Downwash Parasite drag - correct answer Components attached to a helicopter that dont contribute to lift Total drag - correct answer Sum of profile, induced, and parasite drag. Bernoullis principle - correct answer As flow increases, pressure decreases Phases of flight - correct answer Takeoff, climb, cruise, descent, landing. Flat and curved side pressure - correct answer Flat side is high pressure, curved side is low pressure Angle of attack - correct answer Angle between the chord line and the relative wind ( it's an aerodynamic angle) angle of incidence - correct answer Angle between chord line and the rotor systems place of rotation ( mechanical angle) Stall region - correct answer The inner one quarter of the blade. Driving region - correct answer In between the stall and driven region. Driven region - correct answer The outer 30% of a blade. Blade twist - correct answer Greater pitch angles near the root and shallower near the blade tip Effective translational lift - correct answer Experienced between 16 to 24 knots In ground effect - correct answer Additional lift is provided from the ground when the altitude is one length or less then the main rotor diameter. Rotational relative wind - correct answer Tip path plane, wind velocity is greatest at the tip of each blade Rotor system parts (4) - correct answer Hub, tip, root,twist Total aerodynamic force - correct answer Two components comprise this lift and drag Translating tendency ( drift ) - correct answer A helicopter with one main rotor tends to drift in the direction of the tail rotor thrust First law of motion - correct answer Until acted on by an external force, an objects velocity will remain constant ( an object at rest will remain at rest and in object in motion will remain in motion until a force is applied) Second law of motion - correct answer Algebraically is F=m*a ( how the velocity of an object changes when it is subject to another force) Third law of motion - correct answer for every action there is an equal and opposite reaction Acceleration of gravity - correct answer Is 9.81 m/s squared Torque equation - correct answer T= F*r Gravitation potential energy - correct answer PE= m*g*h (m is mass, g is 9.81, and h is height)