How Much Do You Know About Helicopter? Helicopter Quiz
A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. Helicopters are noisy yet fun to use, do you believe you are well aware of the various functions of parts of a helicopter? Take the simple test below and find out. Have fun!
- 1.The purpose of the ventral fin on a helicopter is to provide
- A.
Directional stability
- B.
Lateral stability
- C.
Longitudinal stability
- 2.When the lift of an airfoil increase, the drag will
- A.
Also increase
- B.
Decrease
- C.
Increase while the lift is changing but will retrun to its original value
- 3.Ground resonance is a self-excited vibration found in
- A.
Fully articulated rotors
- B.
Semi-articulated rotors
- C.
Semi-rigid rotors
- 4.The cable operated control system of an all metal helicopter not incorporating a temperature compensating device, has been rigged to the correct tension in a heated hangar. If the helicopter is operated in very cold weather, the cable tension will
- A.
Decrease when the aircraft structure and cable become cold.
- B.
Increase when the aircraft structure and cables become cold.
- C.
Be unaffected if stainless steel cable is intalled.
- 5.The elevator of a conventional helicopter is used to provide stability about the
- A.
Lateral axis
- B.
Vertical axis
- C.
Longitudinal axis
- 6.What is the purpose of the swash plate?
- A.
Transmits control inputs to rotor head.
- B.
Coordinates control inputs from hydraulic pack.
- C.
It disconnects the rotor whenever the engine stops or slows below the equivalent of rotor RPM.
- 7.The universal propeller protractor can be used to measure
- A.
Blade pitch angle.
- B.
Degrees of blade flap travel
- C.
Propeller track.
- 8.The chord of a main rotor is measured from
- A.
Leading edge to trailing edge.
- B.
Blade tip to blade tip
- C.
Blade tip to blade butt
- 9.The acute angle formed by the chord line of the rotor and the relative wind is known as the
- A.
Angle of attack
- B.
Lonitudinal dihedral angle
- C.
Angle of incidence
- 10.If a single rotor helicopter is in forward horizontal flight, the angle of attack of the retreating blade is
- A.
More than the advacing blade
- B.
Equal to the advacing blade
- C.
Less than the advancing blade
- 11.Which of the following are NOT functions of the tail rotor?
- A.
Lateral control
- B.
Sideways flight
- C.
Compensation for torque
- 12.An increase in pitch angle of the tail rotor blades on a helicopter
- A.
Causes the tail to pivot in the opposite driection of torque rotaiton around the main rotor axis
- B.
Causes the tail to pivot in the direction of torque rotaion around the main rotor axis
- C.
Is required to counteract main rotor torque produced by takeoff RPM
- 13.A fully articulated rotor head compensates for dissymmetry of lift through the employment of a
- A.
Flapping hinge
- B.
Swival plate
- C.
Coning device
- 14.In a hovering helicopter equippted with tail rotor, altitude control is maintained by
- A.
Changing pitch of main rotor blades
- B.
Varying the pitch of the tail rotor blades
- C.
Changing the tail rotor RPM
- 15.If a severe abnormal vertical vibration developed in a helicopter equipped with a two blade rotor system, it would indicate that the
- A.
Rotor blades are out of track
- B.
Rotor blades are out of balance
- C.
Blade "droop" stops are not adjusted properly
- 16.What control is the throttle attached to
- A.
The top or grip of the cellective
- B.
The top of the cyclic
- C.
The quadrant on the console
- 17.If the tail rotor of a helicopter fails to compensate accurately for the torque of the main rotor
- A.
The tail rotor is inaccurately rigged
- B.
The engine power suddenly drops
- C.
Collective is rigged at too high an angle
- 18.What does the cyclic pitch control of a helicopter do?
- A.
Tilts the tip path plane in the direction of desired movement.
- B.
Changes pitch on both blades equally.
- C.
Controls rotor RPM and manifold pressure.
- 19.The main rotor drag brace is adustable in order to
- A.
Blance the main rotor in a chordwise direction.
- B.
It is not adjustable
- C.
Balance the main rotor in a spanwise direction
- 20.The swashplate control tilts only when
- A.
Cyclic is moved
- B.
Collective control action
- C.
Collective sleeve movement
- 21.After accelerating into forward flight, the synchronized elevator tends to
- A.
Lower the tail boom
- B.
Rest in the neutral position
- C.
Raise the tail boom
- 22.A high frequency vibration may be caused by
- A.
The tail rotor being out of spanwise balance
- B.
The main rotor being out of spanwise balance
- C.
The main rotor being out of track
- 23.Tracking of helicopter rotor blades is normally done
- A.
While the blades are rotating at a specific RPM and collective pitch angle
- B.
On a special fixture before they are installed due to their flexibility
- C.
By direct measurement from the fuselage structure to a specific blade station when the blade is parallel to the fuselage centerline
- 24.Greater down wash effect through the aft part of the main rotor disk compared to the forward part of the disk is
- A.
Transverse flow lift
- B.
Transitional lift
- C.
Coriolis effect
- 25.What kind of vibration would an out-of-track helicopter main rotor normally cause?
- A.
Low frequency vertical vibration
- B.
High frequency vertical vibration
- C.
Low frequency lateral vibration
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