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SIFT: Aviation multiple choice questions with Answers
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SIFT: Aviation multiple choicequestions with Answers
What part of a rotary-wing aircraft makes directional control possible?
A. the teeter hinge
B. the swashplate
C. the ducted fan
D. the tail boom
E. the skids - -A. Incorrect. The teeter hinge allows the blades to flap
B. CORRECT. The swashplate allows for directions movement of the aircraft
C. Incorrect. The ducted fan is a component of the NOTAR aircraft design.
D. Incorrect. The tail boom is a structural component that supports the tail
rotor assembly.
E. Incorrect. The skids are used as landing gear for rotary-wing aircraft.
-Which of these US Army helicopters is classified as tandem rotor?
A. LUH-72
B. CH-47
C. AH-64
D. UH-60
E. OH-58D - -B. CORRECT. The CH-47 Chinook is a tandem rotor helicopter.
A, C, D, and E, Incorrect. All are conventional main rotor with tail rotor
configurations.
-What is the preferred method of ground movement for helicopters on
airports?
A. ground taxi
B. air taxi
C. taxi
D. hover taxi
E. progressive taxi - -A. Incorrect. This phrase is not in the pilot/controller
glossary.
B. CORRECT. Air taxi enables the pilot to proceed at an optimum
airspeed/altitude, minimize downwash effect, conserve fuel, and expedite
movement from one point to another.
,C. Incorrect. This phrase implies the pilot will taxi on the airport surface via
taxiways or other prescribed routes.
D. Incorrect. This phrase implies slow movement, usually below 25' AGL.
E. Incorrect. This phrase calls for precise taxi instructions to be given to a
pilot unfamiliar with the airport or issued in stages as the aircraft proceeds
along the taxi route.
-What type of helicopter design uses a ducted fan in place of a tail rotor to
cancel torque effect?
A. the coaxial rotor system
B. the NOTAR
C. the tandem rotor system
D. the semi-monocoque
E. the skids - -A. Incorrect. The coaxial rotor system cancels torque effect by
using counter-rotating rotor heads.
B. CORRECT. The NOTAR design uses a ducted fan to vector air out of the tail
to cancel torque effect
C. Incorrect. The tandem rotor system cancels torque effect through the use
of counter-rotating rotor heads.
D. Incorrect. The term "semi-monocoque" refers to a fuselage type that
utilizes longitudinal reinforcement to add strength.
E. Incorrect. The skids are used as landing gear for rotary-wing aircraft.
-Which aerodynamic force(s) must a rotary-wing aircraft balance in order to
hover?
A. weight, lift, thrust, and drag
B. translational lift
C. dissymmetry of lift
D. gyroscopic precession
E. autorotation - -A. CORRECT. Weight, lift, thrust, and drag must be in
balance in order to hover.
B. Incorrect. An effective translational lift results from increased efficiency of
the main rotor system as directional flight is established.
C. Incorrect. Dissymmetry of lift is the unequal lifting of forces created by the
advancing and retreating blades.
, D. Incorrect. Gyroscopic procession is when a force input is applied yet the
force output is felt 90 degrees later in the plane of rotation.
E. Incorrect. Autorotation is when the rotor blades are driven by relative wind
rather than by the aircraft's powerplant.
-How would a high-density altitude affect the performance of a helicopter?
A. Performance would be good due to the high value of the air density.
B. Performance may improve or be decreased: the density altitude has to be
corrected for nonstandard temperature.
C. Engine performance would increase, but rotor performance would
decrease.
D. Performance would be decreased due to low value of the air density.
E. Density altitude is not as important a factor in performance as
temperature and humidity. - -A. Incorrect. High-density altitude indicates
low-density air, which is typically found at high altitudes and above standard
temperatures.
B. Incorrect. Density altitude is pressure altitude corrected for nonstandard
temperature.
C. Incorrect. A high-density altitude would decrease both engine and rotor
performance.
D. CORRECT. As air density decreases, engine power output, rotor efficiency,
and aerodynamic lift also decrease.
E. Incorrect. Temperature and humidity are factors in determining density
altitude and are therefore not more important to performance, although
humidity is difficult to calculate and is rarely included in performance
calculations.
-If the airspeed indicator needle is in the yellow and approaching the red
line during a maneuver, what would be the correct response?
A. change attitude by 90 degrees
B. decrease altitude
C. decrease airspeed
D. increase airspeed
E. increase thrust - -A. Incorrect. A change of heading would not reduce
airspeed.
B. Incorrect. Decreasing altitude will result in an initial higher airspeed.
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