SIFT Army Aviation Information Practice Test 2023 passed

SIFT Army Aviation Information Practice TestA helicopter is - correct answer A type of rotorcraft Helicopter turbine engines produce ___________ thrust per pound than piston engines - correct answer More The four main forces working on a helicopter are - correct answer Lift, weight, thrust, drag Helicopters typically have between ___ and ___ main rotor blades - correct answer 2 and 6 Depending on the type of helicopter, main rotor system components can include - correct answer A stabilizer bar, upper/lower swashplates, counterweights, pitch horns, teeter/coning hinges, blade grips, pitch/scissor links, control rods The function of the flybar is - correct answer To decrease crosswind thrust on the blades and enhance flight stability by keeping the bar stable as the rotor spins Many helicopters have a horizontal stabilizer located _____ - correct answer On the tail boom The purpose of the tail rotor is: - correct answer To produce an anti-torque force acting perpendicular to the helicopter's longitudinal axis. Wheels on _____ types of helicopters are _____ - correct answer Some, retractable A pilot controls a helicopter using: - correct answer Pedals, a collective, throttle, cyclic From a physics perspective, the _____ force is deemed to act through a helicopter's _____ - correct answer Total weight, center of gravity When a pilot banks a helicopter, causing it to turn, _____ - correct answer The machine's weight increases In the case of helicopters, lift is produced by _____ moving through the air at a speed sufficient to create - correct answer Airfoils, a pressure differential Thrust acts _____ to the aircraft's _____ - correct answer Parallel, longitudinal axis Profile drag consists of - correct answer Profile drag is usually defined as the sum of form drag(Shape of the object) and skin friction(imperfections) Vortices produced by spinning rotor blades create - correct answer Induced drag When plotted on a graph, L/DMAX is the point where the helicopter's _____ - correct answer Total lift-to-drag ration is the greatest A helicopter's potential energy is affected by - correct answer The aircraft's height above the ground Which of the following factors affect the lift produced by spinning rotor blades - correct answer Airfoil coefficient of lift, air density, blade area What happens when a helicopter's main rotor blades spin rapidly? - correct answer The upper and lower sides of each blade experience a difference in pressure Newton's third law of motion applies to helicopters because - correct answer The spinning main rotor makes the aircraft try to spin in the opposite direction