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TECHGEN-BNC-MODULE12
1.
Helicopters are refuelled:
a) Using the gravity system only.
b) By either gravity or pressure refuelling methods.
c) Using the pressure refuelling system only.
d) Fully on completion of flight to prevent condensation.
2.
The purpose of the primary stops in a flying control system is to:
a) bring the main and tail rotors to rest as soon as possible after shut-down
b) restrict the movement of the controls within the correct range
c) act as a stop in case of vibration of the controls
d) prevent damage to the system when the helicopter is parked in high winds
3.
Blade hinges arranged with a "delta three" hinge effect:
a) increase their pitch angle with flap up
b) increase the lift of the blade with flap up.
c) decrease their pitch angle with flap up
d) decrease their pitch angle with blade dragging
4.
The purpose of a main rotor blade tracking check is to ensure:
a) the correct coning angle
b) that the neutral control settings are correct
c) that the pitch angle for all blades is absolutely equal.
d) that all blades have the same tip-path plane
5.
Heating systems for helicopters may obtain hot air from the following sources: 1. Air tapped from the engine compressor. 2. Air tapped from the engine turbine. 3. Ambient air heated by electrical elements. The combination grouping all of the correct statements is:
a) 1
b) 1, 3.
c) 2, 3.
d) 2
6.
Fuel cells as used on helicopters:
a) Produce DC power for emergency use only.
b) Produce AC power for emergency use only.
c) Are vented and drained to atmosphere.
d) Contain fuel booster pumps which must be segregated for multi-engine helicopters.
7.
Warning lights associated with basic pitot/static heating systems in helicopters usually inform the pilot that, when illuminated:
a) The heating element has failed.
b) The power supply to the system has failed.
c) Either the heating element or the power relay has failed.
d) The heating system is on and the heater is cycling on/off.
8.
Fuel tank vents are:
a) Fitted to the lower part of the tank and routed direct to atmosphere.
b) Fitted to duct fuel vapour from the tank to the engine exhaust.
c) Fitted to the top of the tank to prevent tank collapse and are routed to the opposite upper part of the fuselage.
d) Routed so that all tanks are interconnected to maintain an equal pressure throughout the system.
9.
Cockpit indications associated with a windscreen heating system usually comprise:
a) A green system 'ON' information light and an amber system failure light.
b) Of only the position of the selector switch.
c) Green or blue lights which cycle on/off with the function of the heating elements.
d) Amber lights when the system is functioning with a red warning should the windscreen enter an overheat condition.
10.
The purpose of a clutch in a helicopter transmission system is to:
a) permit the engine to be started with a low inertial loading
b) disengage the tail rotor drive in the event of a malfunction
c) permit the rotor to rotate freely during autorotation
d) prevent the rotor turning in the wind when parked on the ground
11.
Unusable fuel is:
a) The amount of fuel not available for use but included on the fuel contents gauge.
b) Sometimes minimised by the incorporation of tank sump pads.
c) Always the same quantity irrespective of aircraft attitude or flight conditions.
d) Fuel drained from the helicopter due to water contamination.
12.
Helicopter engine Bellmouth air intakes:
a) May be heated by either hot oil, electric mats or engine bleed air.
b) Are always heated by engine bleed air from the engine compressor.
c) Are always heated by electrically heated mats.
d) Are not heated.
13.
Horizontal stabilisers:
a) Are adjustable surfaces used to compensate for the change of C of G.
b) May be fitted with inflatable boots to provide a de-icing function.
c) Are de-iced by the exhaust from the engines.
d) Are fitted opposite to the tail rotor in some helicopters to assist the tail rotor in controlling yaw.
14.
In a piston engine, magnetos are used to produce the spark which ignites the fuel/air mixture. The operating principle of magnetos consists in:
a) accumulating in a condenser a low volt current from the battery, reconstitute it as high voltage current at the moment the spark is generated.
b) creating a brief high intensity magnetic field which will be sent through the distributor at the appropriate time.
c) obtaining a high amp low volt current in order to generate the spark.
d) breaking the primary current in order to induce a low amp high volt current which is distributed to the spark plugs.
15.
Integral fuel tanks:
a) Is the name given to a group of fuel tanks where several tanks feed a master tank which in turn supplies the engine.
b) Are small fuel tanks fitted on the engine to ensure a positive supply of fuel to the engine driven fuel pump and receive excess fuel from pumps and control units.
c) Are not used on helicopters.
d) Comprise a portion of the aircraft structure which has been sealed to form a fuel tank.
16.
Multiple fuel tanks fitted to a large twin-engine helicopter are connected:
a) To each other to maintain an equal fuel level in each tank.
b) To allow cross-feed operations to maintain the centre of gravity within limits.
c) To ensure supply to each engine whilst maintaining centre of gravity within limits.
d) In groups feeding a common fuel tank for engine supply.
17.
Which of the following is true with respect to heating of pitot and static sensors:
a) Combined pitot/static tubes are always heated but static ports are never heated.
b) Pitot tubes are always provided with a heater while static points may also be heated.
c) Both pitot and static sensing is always heated.
d) Pitot and static sensing is not heated on a helicopter.
18.
The global output of a piston engine is of: (global output = Thermal energy corresponding to the available shaft/power over the total thermal energy produced).
a) 0.3
b) 0.75
c) 0.9
d) 0.5
19.
In the event of an engine fire:
a) An automatic shut off valve is moved to the closed position controlled by the fire sensing system.
b) The fuel supply is disconnected by a quick release coupling.
c) The fuel installation is protected by an automatic fire extinguishing system.
d) The fuel supply is isolated from the engine by a pilot controlled fuel shut off valve.
20.
Warning devices associated with air conditioning systems fitted in helicopters are limited to:
a) An amber system "ON" information light, a green serviceable light and either a red or amber duct overpressure light.
b) Amber bleed air failure warning lights and red fire warnings for three wheel air cycle machine failure.
c) A green system serviceable light and an amber warning light.
d) A green system "ON" information light and amber bleed air failure lights.
21.
The engine fuel control unit (FCU) is protected from damage by debris by:
a) Strainers at the inlet to the low pressure fuel pumps.
b) A fine filter located prior to the high pressure fuel pump at the inlet to the fuel control unit.
c) Magnetic plugs located at various positions throughout the fuel supply usually at the outlet of fuel pumps and valves.
d) The fine filter located between the high pressure fuel pump and the governor unit.
22.
In a free-turbine helicopter installation:
a) the main rotor drive and the compressor are on a common shaft
b) there is no need for a clutch between the engine and the transmission
c) a free-wheel is required between the compressor and the turbine
d) there must be a clutch between the engine and transmission
23.
"Vapour lock" is the phenomenon by which:
a) abrupt and abnormal enrichment of the fuel/air mixture following an inappropriate use of carburettor heat.
b) water vapour plugs are formed in the intake fuel line following the condensation of water in fuel tanks which have not been drained for sometime.
c) burnt gas plugs forming and remaining in the exhaust manifold following an overheat and thereby disturbing the exhaust.
d) heat produces vapour plugs in the fuel line.
24.
The connection in parallel of two 12 volt/ 40 amp hours batteries, will create a unit with the following characteristics;
a) 12 volt / 80 amp hours
b) 24 volt / 40 amp hours
c) 24 volt / 80 amp hours
d) 12 volt / 40 amp hours
25.
The cross-feed fuel system enables:
a) the supply of any jet engine from any fuel tank.
b) the supply of the jet engines mounted on a wing from any fuel tank within that wing.
c) the supply of the outboard jet engines from any outboard fuel tank.
d) only the transfer of fuel from the centre tank to the wing tanks.
26.
For a piston engine, the ideal fuel/air mixture corresponding to a richness of 1 is obtained for a weight ratio of:
a) 1/12th
b) 1/9th
c) 1/15th
d) 1/10th
27.
Helicopter fuel tank booster pumps:
a) Are AC powered, vane type pumps.
b) Produce a high pressure head of fuel to the engine.
c) Deliver an excess to requirements quantity of fuel at low pressure.
d) Are only required for cross-feed purposes.
28.
Fuel pumps submerged in the fuel tanks of a multi-engine aircraft are:
a) centrifugal high pressure pumps.
b) centrifugal low pressure type pumps.
c) high pressure variable swash plate pumps.
d) low pressure variable swash plate pumps.
29.
Rotational drive from the gearbox to the rotorhead is transmitted by the:
a) swashplate assembly
b) main drive shaft
c) pitch change arms
d) scissors
30.
Windscreen heating systems usually:
a) Consist of warm air from the cabin conditioning system blown across the inner surface of the windscreen.
b) Are powered from the emergency DC Bus.
c) Depend upon the pilot monitoring the windscreen temperature probe for control of the heating system.
d) Cycle on/off to maintain a windscreen temperature between approximately 18° and 35°C.
31.
Fuel tanks in modern helicopters are normally located:
a) In the lower fuselage under baggage compartments.
b) Directly below the engines.
c) In the tail boom.
d) In the lower fuselage with the centre of gravity coinciding with a line extended from the main rotor mast.
32.
In a helicopter with a twin engine installation:
a) Fuel is always supplied to an individual engine from a dedicated fuel tank group with the ability to cross-feed when necessary.
b) A master fuel tank is always used to ensure a head of fuel is available to both engines.
c) A master fuel tank is usually used with a cross-feed arrangement throughout the groups of tanks for fuel feed and centre of gravity purposes.
d) Fuel is usually supplied to an individual engine from a dedicated fuel tank group with the ability to cross-feed when necessary.
33.
If the automatic control of an air conditioning system fails:
a) Manual control can be selected but this is limited to 'hot air' or 'cold air' only.
b) The system must be shut down.
c) The red failure light will illuminate.
d) The pilot can revert to manual control and 'beep' the control valve to the required setting.
34.
A rotor blade trim tab provides a corrective force:
a) by varying blade drag so repositioning the blade in azimuth relative to other blade(s)
b) directly, by its displacement causing the blade to track in the correct plane
c) indirectly, by causing the pitch angle to change, thus altering blade lift in the appropriate sense
d) indirectly, by adjusting the centre of gravity of the blade longitudinally, thus causing the blade to track in the correct plane
35.
Temperature regulation of an air conditioning system:
a) Is automatically controlled by sensing the output temperature from the control valve in relation to the temperature set on the pilot's control panel.
b) Is manually controlled by the pilot reading the cabin temperature gauge and increasing or decreasing hot air as required.
c) Is automatically controlled by sensing cabin temperature in relation to engine compressor outlet temperatures.
d) Cannot be automatically controlled.
36.
The main reason for opening the cowl flaps is to control the:
a) oil temperature
b) cabin temperature
c) E.G.T (exhaust gas temperature)
d) C.H.T. (cylinder head temperature)
37.
A multi-engine helicopter is usually equipped with a fuel cross-feed system:
a) To allow any engine to be fed from any fuel group.
b) Allowing the pilot to maintain the centre of gravity of the helicopter within limits.
c) Which allows gravity refuelling where pressure refuelling facilities are not available.
d) To automatically re-direct fuel flow in the event of engine failure.
38.
Fuel supply to helicopter engines:
a) Is always provided by booster pump only.
b) May be provided by booster pump, gravity feed or by suction from the engine driven fuel pump.
c) Is always a positive feed from a common fuel tank to all engines.
d) May be provided by the charge delivered during pressure refuelling.
39.
The throttle control may be interconnected with:
a) the collective lever, to increase power with increased pitch application
b) the collective lever, to decrease power with increased pitch application
c) the yaw pedals, to increase tail rotor speed for directional control inputs
d) the cyclic stick, to increase power for cyclic control inputs
40.
For a large helicopter , ram air ventilation:
a) May be provided throughout the cabin from ducts in doors only.
b) May be provided throughout the cockpit and cabin through a series of ducts in windows and doors.
c) Is provided to pilots only.
d) Is ducted from the downwash of the main rotors to gasper ducts throughout the helicopter.
41.
An unshrouded tail rotor has:
a) RPM control independently of the main rotor
b) different pitch change to each blade
c) cyclic pitch control only
d) equal pitch change to all blades
42.
Fuel system ice traps:
a) Are devices fitted to the engine and heated using engine oil or hot air tapped from the compressor.
b) May be fitted in the fuel delivery line between the fuel tank and the engine.
c) Are not required on helicopters due to the inability of the aircraft to fly at high altitude.
d) Are replaced by water traps in the bottom of the fuel tanks on helicopters.
43.
Helicopter fuel tank vents pass to the opposite side of the fuselage upper structure to:
a) Prevent spillage of fuel should the helicopter roll over on crash landing.
b) Maintain appropriate tank venting during fuel cross-feed following single engine failure.
c) Ensure all tank groups are equally vented.
d) Ensure equal back pressure is passed into the vent system from the rotor downwash.
44.
Power for windscreen heating is usually:
a) 28 volts DC.
b) 3 phase AC.
c) Single phase AC.
d) 115 volts DC.
45.
A freon air conditioning system comprises:
a) A heat exchanger taking air from the engine to provide air to the cabin over a wide range of temperatures.
b) An electrically driven compressor and heat exchanger arrangement which uses ambient to supply the cabin with air over a wide range of temperatures.
c) An electrically driven compressor to supply warm air for heating and a heat exchanger to provide cold air.
d) A compressor and heat exchanger to provide cold air to the cabin with hot air supplied from the engine for heating.
46.
Low frequency vibration in a plane parallel to the rotor plane is likely to be associated with:
a) an out-of-balance main rotor
b) an out-of-balance tail rotor
c) an engine problem
d) a transmission problem
47.
The tanks of a hydraulic system are pressurized:
a) by an auxiliary system.
b) in flight only.
c) by the air conditioning system.
d) by bleed air coming from the turbine-engine.
48.
Engine oil reservoirs are sometimes located at the front of the engine:
a) To provide an attachment point for the mounting of the compressor and turbine bearings.
b) Because it is the most distant position from the exhaust.
c) To allow the hot oil to heat the air intake.
d) To utilise the structure necessary to contain the oil to form the engine accessory gearbox and provide mounting points for oil and fuel pumps.
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