SIFT (Army Aviation Information Practice
Test) Questions and Answers
A helicopter is:
A. A type of gyrocraft.
B. A type of rotorcraft.
C. A category of rotary-wing airplanes.
D. A sub-group - ANSWER-B. A type of rotorcraft.
Helicopter turbine engines produce ___________ thrust per pound than piston engines:
A. less.
B. the same.
C. more.
D. the same, but only after factoring n the effect of density altitude. - ANSWER-C. more.
The main forces acting on a helicopter are:
A. Induced lift, mass, thrust, and form drag.
B. Lift, weight, thrust, and drag.
C. Lift, gravity, air resistance, and rotor vortex drag.
D. None of the above. - ANSWER-B. Lift, weight, thrust, and drag.
Helicopters typically have between ___ and ___ main rotor blade(s):
A. 2,6
B. 2,10
C. 3,8
D. 3,7 - ANSWER-A. 2,6
Depending on the type of helicopter, main rotor system components can include:
A. A stabilizer bar, upper and lower swash plates, and counterweights.
B. Pitch horns, teeter or coning hinges, and blade grips.
C. Pitch and scissor links, and control rods.
D. All the above. - ANSWER-D. All the above.
The function of the flybar is:
, A. To decrease thrust on the blades and enhance flight stability by keeping the bar
stable as the rotor spins.
B. To increase thrust and modify flight stability by allowing the bar to spin at a slower
speed than the main rotor.
C. To decrease crosswind thrust and augment flight stability by maintaining the bar at
an acute angle to the main rotor.
D. To spin in a direction opposite to the main rotor's, thereby reducing induced drag. -
ANSWER-A. To decrease thrust on the blades and enhance flight stability by keeping
the bar stable as the rotor spins.
Many helicopters have a horizontal stabilizer located:
A. On the mast.
B. On the tail boom.
C. On the fin.
D. None of the above. - ANSWER-B. On the tail boom.
The purpose of the tail rotor is:
A. To create kinetic energy that is transformed into potential energy as the helicopter
climbs.
B. To produce rotational momentum that is used by the transmission to drive a
generator.
C. To produce an anti-torque force acting perpendicular to the helicopter's longitudinal
axis.
D. All the above. - ANSWER-C. To produce an anti-torque force acting perpendicular to
the helicopter's longitudinal axis.
Wheels on _____ types of helicopters are _____:
A. all, retractable (to reduce drag).
B. some, supplementary to skids.
C. some, retractable.
D. all, supplementary to skids. - ANSWER-C. some, retractable.
A pilot controls a helicopter using:
A. Flight instruments, hydraulic actuators, and a cyclic with a twist throttle.
B. Flight instruments, pedals, two or more throttle levers, and avionics.
C. Pedals, a throttle, with a twist grip, collective link rods, and a cyclic.
D. Pedals, and a collective, throttle, and cyclic. - ANSWER-D. Pedals, and a collective,
throttle, and cyclic.
From a physics perspective, the ______ force is deemed to act through a helicopter's
__________:
Test) Questions and Answers
A helicopter is:
A. A type of gyrocraft.
B. A type of rotorcraft.
C. A category of rotary-wing airplanes.
D. A sub-group - ANSWER-B. A type of rotorcraft.
Helicopter turbine engines produce ___________ thrust per pound than piston engines:
A. less.
B. the same.
C. more.
D. the same, but only after factoring n the effect of density altitude. - ANSWER-C. more.
The main forces acting on a helicopter are:
A. Induced lift, mass, thrust, and form drag.
B. Lift, weight, thrust, and drag.
C. Lift, gravity, air resistance, and rotor vortex drag.
D. None of the above. - ANSWER-B. Lift, weight, thrust, and drag.
Helicopters typically have between ___ and ___ main rotor blade(s):
A. 2,6
B. 2,10
C. 3,8
D. 3,7 - ANSWER-A. 2,6
Depending on the type of helicopter, main rotor system components can include:
A. A stabilizer bar, upper and lower swash plates, and counterweights.
B. Pitch horns, teeter or coning hinges, and blade grips.
C. Pitch and scissor links, and control rods.
D. All the above. - ANSWER-D. All the above.
The function of the flybar is:
, A. To decrease thrust on the blades and enhance flight stability by keeping the bar
stable as the rotor spins.
B. To increase thrust and modify flight stability by allowing the bar to spin at a slower
speed than the main rotor.
C. To decrease crosswind thrust and augment flight stability by maintaining the bar at
an acute angle to the main rotor.
D. To spin in a direction opposite to the main rotor's, thereby reducing induced drag. -
ANSWER-A. To decrease thrust on the blades and enhance flight stability by keeping
the bar stable as the rotor spins.
Many helicopters have a horizontal stabilizer located:
A. On the mast.
B. On the tail boom.
C. On the fin.
D. None of the above. - ANSWER-B. On the tail boom.
The purpose of the tail rotor is:
A. To create kinetic energy that is transformed into potential energy as the helicopter
climbs.
B. To produce rotational momentum that is used by the transmission to drive a
generator.
C. To produce an anti-torque force acting perpendicular to the helicopter's longitudinal
axis.
D. All the above. - ANSWER-C. To produce an anti-torque force acting perpendicular to
the helicopter's longitudinal axis.
Wheels on _____ types of helicopters are _____:
A. all, retractable (to reduce drag).
B. some, supplementary to skids.
C. some, retractable.
D. all, supplementary to skids. - ANSWER-C. some, retractable.
A pilot controls a helicopter using:
A. Flight instruments, hydraulic actuators, and a cyclic with a twist throttle.
B. Flight instruments, pedals, two or more throttle levers, and avionics.
C. Pedals, a throttle, with a twist grip, collective link rods, and a cyclic.
D. Pedals, and a collective, throttle, and cyclic. - ANSWER-D. Pedals, and a collective,
throttle, and cyclic.
From a physics perspective, the ______ force is deemed to act through a helicopter's
__________:
