[SIFT] ARMY AVIATION INFORMATION
EXAM QUESTIONS WITH SOLUTIONS
A helicopter is:
A. A type of gyrocraft.
B. A type of rotorcraft.
C. A category of rotary-wing airplanes.
D. A sub-group of gyrocopters. - -b
-Helicopter turbine engines produce ___ thrust per pound than piston
engines:
A. less
B. the same
C. more
D. the same, but only after factoring in the effect of density altitude - -c
-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. - -b
-Helicopters typically have betweeen __ and __ main rotor blade(s):
A. 2, 6.
B. 2, 10.
C. 3, 8.
D. 3, 7. - -a
-Depending on the type of helicopter, main rotor system components can
include:
A. A stabilizer bar, upper and lower swashplates, and counterweights.
B. Pitch horns, teeter or coning hinges, and blade grips.
C. Pitch and scissor links, and control rods.
D. All of the above. - -d
-The function of the flybar is:
A. To decrease crosswind thrust on the blades and enhance flight stability by
keeping the bar stable as the rotor spins.
B. To increase crosswind 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. - -a
, -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. - -b
-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 of the above. - -c
-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. - -c
-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. - -d
-From a physics perspective, the ___ force is deemed to act through a
helicopter's ___:
A. lift, center of motion.
B. total weight, center of gravity.
C. induced drag, longitudinal axis.
D. total mass, center of motion. - -b
-When a pilot banks a helicopter, causing it to turn, ___:
A. The machine's weight increases.
B. The machine's weight decreases.
C. The machine's gravitational drag increases.
D. The vertical component of the lift vector remains the same. - -a
-In the case of helicopters, lift is produced by ___ moving through the air at a
speed sufficient to create ___:
A. rotor blades, gyroscopic precession.
B. the flybar, an anti-drag force.
C. airfoils, a pressure differential.
EXAM QUESTIONS WITH SOLUTIONS
A helicopter is:
A. A type of gyrocraft.
B. A type of rotorcraft.
C. A category of rotary-wing airplanes.
D. A sub-group of gyrocopters. - -b
-Helicopter turbine engines produce ___ thrust per pound than piston
engines:
A. less
B. the same
C. more
D. the same, but only after factoring in the effect of density altitude - -c
-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. - -b
-Helicopters typically have betweeen __ and __ main rotor blade(s):
A. 2, 6.
B. 2, 10.
C. 3, 8.
D. 3, 7. - -a
-Depending on the type of helicopter, main rotor system components can
include:
A. A stabilizer bar, upper and lower swashplates, and counterweights.
B. Pitch horns, teeter or coning hinges, and blade grips.
C. Pitch and scissor links, and control rods.
D. All of the above. - -d
-The function of the flybar is:
A. To decrease crosswind thrust on the blades and enhance flight stability by
keeping the bar stable as the rotor spins.
B. To increase crosswind 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. - -a
, -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. - -b
-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 of the above. - -c
-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. - -c
-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. - -d
-From a physics perspective, the ___ force is deemed to act through a
helicopter's ___:
A. lift, center of motion.
B. total weight, center of gravity.
C. induced drag, longitudinal axis.
D. total mass, center of motion. - -b
-When a pilot banks a helicopter, causing it to turn, ___:
A. The machine's weight increases.
B. The machine's weight decreases.
C. The machine's gravitational drag increases.
D. The vertical component of the lift vector remains the same. - -a
-In the case of helicopters, lift is produced by ___ moving through the air at a
speed sufficient to create ___:
A. rotor blades, gyroscopic precession.
B. the flybar, an anti-drag force.
C. airfoils, a pressure differential.
