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Question 252-1 : In most helicopter types the rotor brake is normally situated ? [ Explanation maintenance ]
Immediately after the main gearbox on the intermediate drive shaft.
Question 252-2 : The non rotating scissors of a swashplate control system are attached, at their lower attachment point, to the ?
Rotor gearbox.
Question 252-3 : The delta 3 hinge is used to allow ?
Blade pitch to decrease on the upwards flapping blade.
Question 252-4 : In order to permit the rotor blades to rotate freely in autorotation ?
A free wheel unit is fitted between engine and rotor
Question 252-5 : The purpose of the swept back tip region in some modern rotor blade designs is to ?
Improve high speed performance.
Question 252-6 : A conventional tail rotor has ?
Flapping hinges incorporating a delta 3 hinge, together with feathering hinges.
Question 252-7 : Droop restrainers on a rotor head ?
Limit the amount of blade droop when the blades are rotating at low rotor rpm
Question 252-8 : An increase in the angle of attack of a rotor blade, on a helicopter in forward flight will cause the ?
Separation point to move forward.
Question 252-9 : In a helicopter in forward, level flight, the angle of attack of the blades of a main rotor will be ?
Greatest on the retreating side.
Question 252-10 : To obtain minimum power required for still air hovering, induced velocities should ideally ?
Be uniform over the rotor disc.
Question 252-11 : The pressure at the stagnation point on a rotor blade is ?
Static plus dynamic pressure.
Question 252-12 : In a hovering helicopter, recirculated air at the main rotor blade tips will cause ?
A reduction of lift
Question 252-13 : During an autorotation, an increase in collective pitch will 1 rotor thrust, 2 rotor rpm and 3 rate of descent ?
1 increase 2 decrease 3 decrease
Question 252-14 : During flight, an increase in main rotor torque will require ?
An increase in tail rotor pitch.
Question 252-15 : Fenestron blades are equipped with ?
Feathering hinges only.
Question 252-16 : If the coning angle of the main rotor disc is increased ?
The centre of gravity of the blade moves inboard
Question 252-17 : Phase lag of a main rotor blade is the result of ?
Inertia and aerodynamic forces.
Question 252-18 : Cyclic stick movement ?
Alters the disc attitude.
Question 252-19 : The angle of attack of a blade section is the angle between the chord line and the ?
Relative airflow
Question 252-20 : The pitch angle of a rotor blade section is ?
The angle between the chord line and the hub plane
Question 252-21 : The coning angle is the angle ?
Between the longitudinal axis of the blade and the tip path plane
Question 252-22 : The main rotor shaft axis is ?
The axis through the main rotor shaft
Question 252-23 : The axis of rotation of the blades is ?
The axis through the centre of the main rotor head about which the blades rotate
Question 252-24 : The plane of rotation is perpendicular to ?
The axis of rotation and parallel to the tip path plane
Question 252-25 : The tip path plane is ?
The path plane described by the blade tips during rotation and perpendicular to the axis of rotation
Question 252-26 : The type of aerofoil most commonly used for helicopter rotor blades has ?
Symmetrical aerofoil sections.
Question 252-27 : The chord line of a blade section is ?
A straight line from leading to trailing edge
Question 252-28 : The coning angle of a rotor blade is determined by the blade weight and ?
The lift and the centrifugal force.
Question 252-29 : A helicopter rotor system fitted with blade flapping hinges and blade drag hinges is said to be ?
Fully articulated
Question 252-30 : The three basic flight controls in a helicopter are ?
Collective pitch control, cyclic pitch control and yaw control
Question 252-31 : The rotor thrust is ?
An aerodynamic force acting perpendicular to the tip path plane.
Question 252-32 : Rotor blade drag is an aerodynamic force ?
Parallel to the tip path plane.
Question 252-33 : The purpose of the collective pitch control is ?
To change the pitch angle on all rotor blades collectively.
Question 252-34 : Lateral control of the helicopter is obtained by ?
The cyclic pitch control
Question 252-35 : The function of a helicopter tail rotor is ?
To counteract the torque reaction between the revolving main rotor and the fuselage
Question 252-36 : Yawing in a helicopter is the term used to define a rotation ?
About the normal axis
Question 252-37 : Viewed from above, a helicopter in the hover, with anti clockwise rotating blades, if not corrected, would tend to drift to the ?
Right with power on
Question 252-38 : Flapping hinges are fitted to the helicopter rotor system to allow ?
For movement of the blade in the plane perpendicular to the hub plane
Question 252-39 : Drag hinges are fitted to ?
Allow for blade movement in the rotor disc plane.
Question 252-40 : Phase lag is ?
A vertical movement of the blades to a maximum or minimum position at the point approximating 90 degrees further on in the plane of rotation from that at which force was applied.
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