SIFT Army aviation knowledge UPDATED
ACTUAL Exam Questions and CORRECT
Answers
______ is the reduction in fluid pressure that results when a fluid flows through a constricted
section (or choke) of a pipe. - CORRECT ANSWER - The Venturi Effect
Cyclic Control is - CORRECT ANSWER - used to control the direction or tilt of aircraft
The Collective is - CORRECT ANSWER - used to control the pitch angle of all the main
rotor blades collectively
Throttle is - CORRECT ANSWER - used to control the power produced by the engine
Anti-torque pedals are - CORRECT ANSWER - used to control the yaw of the aircraft and
where it is pointing
Airfoil is ______ - CORRECT ANSWER - Either the rotor blades themselves or the
horizontal stabilizers.
The angle between the chord line of an airfoil and the airfoil's direction of motion relative to the
air (Aerodynamic Angle) is called .... - CORRECT ANSWER - Angle of Attack
The angle between the chord line of each blade and the rotor system's plane of rotation
(Mechanical Angle) is called .... - CORRECT ANSWER - angle of incidence
Chord Line is - CORRECT ANSWER - a straight-line intersecting leading and trailing
edges of the airfoil
,The is the angle between the line perpendicular to the mast and the blades in motion. -
CORRECT ANSWER - Coning angle
Autorotation is - CORRECT ANSWER - loss of engine power, angle down so that air
keeps the rotors spinning. The freewheeling unit disconnected
Blade Span is _____________ - CORRECT ANSWER - the length from the tip of the
blade to the drive shaft
What is parasite drag? - CORRECT ANSWER - Drag from components that don't create
lift (Wheels, Fuselage)
A rotating body spins at the same speed unless acted upon by an external force is called -
CORRECT ANSWER - Coriolis force
_____ is the unequal lift across the rotor disk resulting from the difference in the velocity of air
over the advancing blade half and the velocity of air over the retreating blade half of the rotor
disk area. - CORRECT ANSWER - dissymmetry of lift
The driven region is _____the blade tips and normally _____ percent of the radius - CORRECT
ANSWER - nearest from, 30
For helicopters with a main rotor disk that spins counter-clockwise, the airflow speed happens
when each blade reaches the position ______ - CORRECT ANSWER - maximum, three
and nine o'clock
What type of drag is caused by lift? - CORRECT ANSWER - Induced drag
What type of helicopter design uses a ducted fan in place of a tail rotor to cancel the torque
effect? - CORRECT ANSWER - the NOTOR
, Which pitot-static instrument makes use of both pitot and static pressure? - CORRECT
ANSWER - Airspeed indicator
What is the primary principle to counteract the main rotor torque with NOTAR? - CORRECT
ANSWER - Coanda effect
What are the four elements of risk management? - CORRECT ANSWER - pilot, aircraft,
environment, and external pressures
What is the preferred method of ground movement for a helicopter on airports? - CORRECT
ANSWER - Air Taxi
Helicopter's experience effective translational lift while transitioning to forward flight at
approximately _____ to _____ knots - CORRECT ANSWER - 16, 24
When a helicopter is descending at more than 300 fpm, has 20 to 100 percent power, and an
airspeed less than effective translational lift, what aerodynamic condition can occur? -
CORRECT ANSWER - Settling with power
Driven Region - CORRECT ANSWER - Has the effect of slowing the rotor's spin.
Driving Region - CORRECT ANSWER - Supply's thrust.
While transitioning to forward flight at about 16 to 24 knots, the helicopter goes through -
CORRECT ANSWER - Effective Translational Lift
When a force is applied to one side of a spinning object, an action occurs approximately 90° in
the direction of rotation from the point where the force is applied. The action is called -
CORRECT ANSWER - gyroscopic precession
ACTUAL Exam Questions and CORRECT
Answers
______ is the reduction in fluid pressure that results when a fluid flows through a constricted
section (or choke) of a pipe. - CORRECT ANSWER - The Venturi Effect
Cyclic Control is - CORRECT ANSWER - used to control the direction or tilt of aircraft
The Collective is - CORRECT ANSWER - used to control the pitch angle of all the main
rotor blades collectively
Throttle is - CORRECT ANSWER - used to control the power produced by the engine
Anti-torque pedals are - CORRECT ANSWER - used to control the yaw of the aircraft and
where it is pointing
Airfoil is ______ - CORRECT ANSWER - Either the rotor blades themselves or the
horizontal stabilizers.
The angle between the chord line of an airfoil and the airfoil's direction of motion relative to the
air (Aerodynamic Angle) is called .... - CORRECT ANSWER - Angle of Attack
The angle between the chord line of each blade and the rotor system's plane of rotation
(Mechanical Angle) is called .... - CORRECT ANSWER - angle of incidence
Chord Line is - CORRECT ANSWER - a straight-line intersecting leading and trailing
edges of the airfoil
,The is the angle between the line perpendicular to the mast and the blades in motion. -
CORRECT ANSWER - Coning angle
Autorotation is - CORRECT ANSWER - loss of engine power, angle down so that air
keeps the rotors spinning. The freewheeling unit disconnected
Blade Span is _____________ - CORRECT ANSWER - the length from the tip of the
blade to the drive shaft
What is parasite drag? - CORRECT ANSWER - Drag from components that don't create
lift (Wheels, Fuselage)
A rotating body spins at the same speed unless acted upon by an external force is called -
CORRECT ANSWER - Coriolis force
_____ is the unequal lift across the rotor disk resulting from the difference in the velocity of air
over the advancing blade half and the velocity of air over the retreating blade half of the rotor
disk area. - CORRECT ANSWER - dissymmetry of lift
The driven region is _____the blade tips and normally _____ percent of the radius - CORRECT
ANSWER - nearest from, 30
For helicopters with a main rotor disk that spins counter-clockwise, the airflow speed happens
when each blade reaches the position ______ - CORRECT ANSWER - maximum, three
and nine o'clock
What type of drag is caused by lift? - CORRECT ANSWER - Induced drag
What type of helicopter design uses a ducted fan in place of a tail rotor to cancel the torque
effect? - CORRECT ANSWER - the NOTOR
, Which pitot-static instrument makes use of both pitot and static pressure? - CORRECT
ANSWER - Airspeed indicator
What is the primary principle to counteract the main rotor torque with NOTAR? - CORRECT
ANSWER - Coanda effect
What are the four elements of risk management? - CORRECT ANSWER - pilot, aircraft,
environment, and external pressures
What is the preferred method of ground movement for a helicopter on airports? - CORRECT
ANSWER - Air Taxi
Helicopter's experience effective translational lift while transitioning to forward flight at
approximately _____ to _____ knots - CORRECT ANSWER - 16, 24
When a helicopter is descending at more than 300 fpm, has 20 to 100 percent power, and an
airspeed less than effective translational lift, what aerodynamic condition can occur? -
CORRECT ANSWER - Settling with power
Driven Region - CORRECT ANSWER - Has the effect of slowing the rotor's spin.
Driving Region - CORRECT ANSWER - Supply's thrust.
While transitioning to forward flight at about 16 to 24 knots, the helicopter goes through -
CORRECT ANSWER - Effective Translational Lift
When a force is applied to one side of a spinning object, an action occurs approximately 90° in
the direction of rotation from the point where the force is applied. The action is called -
CORRECT ANSWER - gyroscopic precession
