TECHGEN-BNC-MODULE3

TECHGEN-BNC-MODULE3

1. The wing of an aircraft in flight, powered by engines located under the wing, is subjected to a bending moment which causes its leading edge, from the wing root to the wing tip, to operate in:

a) tension.
b) tension, then in compression.
c) compression.
d) compression, then in tension.

2. A rich mixture setting has to be used during climb segments. This results in a

a) slight loss of power.
b) higher torque.
c) higher efficiency.
d) lower cylinder head temperature.

3. The power required for field excitation of the main rotor in modern constant-frequency alternators is directly supplied by:

a) A direct current generator (exciter dynamo).
b) The voltage regulator.
c) An excitation alternator with a permanent magnet generator.
d) An excitation alternator with three-phase generator and revolving diodes.

4. The wavelength of a radio signal transmitted at the frequency 118.7 MHz is:

a) 2.53 m.
b) 2.53 cm.
c) 25.3 m.
d) 25.3 cm.

5. The frequency which corresponds to a wavelength of 12 cm is:

a) 2500 kHz.
b) 2500 MHz.
c) 3600 MHz.
d) 360 MHz.

6. When the pilot moves the mixture lever of a piston engine towards a lean position the:

a) volume of air entering the carburettor is reduced.
b) volume of air entering the carburettor is increased.
c) amount of fuel entering the combustion chamber is increased.
d) amount of fuel entering the combustion chamber is reduced.

7. On modern carburettors, variations in mixture ratios are achieved by the adjustment of:

a) air flow.
b) fuel flow.
c) fuel flow, air flow and temperature.
d) fuel flow and air flow.

8. In the stator of a turbine, the speed V and static pressure Ps vary as follows:

a) V increases, Ps increases.
b) V decreases, Ps increases.
c) V increases, Ps decreases.
d) V decreases, Ps decreases.

9. Pulling the fire shutoff handle causes a number of devices to disconnect. In respect of the AC generator it can be said that the:

a) exciter control relay opens.
b) exciter control relay and the generator breaker open.
c) generator breaker opens.
d) exciter control relay, the generator breaker and the tie breaker open.

10. The accessory units driven by the accessory gearbox of a turbo-jet engine are the: 1. tacho-generator N1 2. tacho-generator N2 3. thrust reverser pneumatic motors 4. AC generator and its Constant Speed Unit (CSD) 5. oil pumps 6. hydraulic pumps 7. high pressure fuel pumps The combination regrouping all the correct statements is:

a) 1, 4, 5, 6, 7.
b) 2, 3, 4, 5, 6, 7.
c) 2, 4, 5, 6.
d) 4, 5, 6, 7.

11. The main advantage of a constant speed propeller as compared to a fixed pitch propeller is a:

a) lower propeller blade stress.
b) higher efficiency in cruising range.
c) constant efficiency in the whole speed range of the aeroplane.
d) high efficiency in a much wider speed range of the aeroplane.

12. The type of gate which requires all conditions with logic 1 for engagement is:

a) AND.
b) NAND.
c) NOR.
d) OR.

13. When changing power on engines equipped with constant-speed propeller, engine overload is avoided by:

a) increasing the manifold pressure before increasing the RPM.
b) reducing the RPM before reducing the manifold pressure.
c) increasing the RPM before increasing the manifold pressure.
d) adjusting Fuel Flow before the manifold pressure.

14. In a pressurized transport aircraft, the protective breathing equipment:

a) protects the members of the crew against smokes and noxious gases.
b) protects the members of the crew against the effects of accidental depressurization.
c) protects all the occupants against the effects of accidental depressurization.
d) gives medical assistance to certain passengers with respiratory disorders.

15. The advantages of grounding the negative pole of the aircraft structure are: 1. Weight saving 2. Easy fault detection 3. Increase of short-circuit risk 4. Reduction of short-circuit risk 5. Circuits are not single-wired lines The combination regrouping all the correct statements is:

a) 1, 2, 4
b) 1, 2, 3
c) 1, 3, 5
d) 2, 3, 5

16. Max. Exhaust Gas Temperature is theoretically associated with:

a) Mixture ratio very close to idle cut-out.
b) Full rich setting.
c) Cruising mixture setting.
d) Mass ratio of 1/15.

17. The fuel temperature, at which, under standard conditions, the vapour ignites in contact with a flame and extinguishes immediately, is the:

a) flash point
b) self ignition point
c) combustion point
d) fire point

18. For take-off, the correct combination of propeller pitch (1), and propeller lever position (2) at brake release is:

a) (1) low (2) forward.
b) (1) low (2) aft.
c) (1) high (2) forward.
d) (1) high (2) aft.

19. In case of engine failure during flight the blades of a constant speed propeller in a single engine aeroplane, not fitted with feathering system

a) move in a certain pitch position depending on windmilling RPM.
b) move in the highest pitch position by the aerodynamic force.
c) move in the lowest pitch position by the centrifugal force and/or the spring force .
d) move in low pitch position by oil pressure created by the windmilling propeller.

20. When applying carburettor heating:

a) no change occurs in the mixture ratio.
b) the mixture becomes richer.
c) a decrease in RPM results from the lean mixture.
d) the mixture becomes leaner.

21. Alternating current can be derived from direct current by:

a) an alternating current motor.
b) an inverter.
c) the use of relays.
d) a series wound motor.

22. On detection of a persistent phase unbalance on an AC generator connected to the aircraft mains, with another AC generator, the protection device opens:

a) the generator breaker.
b) the tie breaker.
c) the exciter control relay and the generator breaker.
d) the generator breaker and the tie breaker.

23. In a fire detection system with single-loop continuous components (with no fault protection), if the line is accidentally grounded:

a) there will be no effect on the system
b) the fire alarm is triggered.
c) the power supply is cut off automatically.
d) the engine fire extinguisher striker is automatically activated.

24. For a given type of oil, the oil viscosity depends on the:

a) oil temperature.
b) oil pressure.
c) outside pressure.
d) quantity of oil.

25. The pitch angle of a constant-speed propeller

a) increases with increasing true air speed.
b) is independent of the true air speed.
c) only varies with engine RPM.
d) decreases with increasing true air speed.

26. When altitude increases without adjustment of the mixture ratio, the piston engine performance is affected because of a:

a) decrease of air density for a smaller quantity of fuel.
b) increase of air density for smaller quantity of fuel.
c) decrease of air density for a constant quantity of fuel.
d) constant air density for a bigger quantity of fuel.

27. What is breathed in when using a passenger oxygen mask?

a) A mixture of oxygen and freon gas.
b) Cabin air and oxygen.
c) Cabin air and oxygen or 100% oxygen.
d) 100% oxygen.

28. Electrical bonding of an aircraft is used to: 1. protect the aircraft against lightning effects. 2. reset the electrostatic potential of the aircraft to a value approximating 0 volt 3. reduce radio interference on radio communication systems 4. set the aircraft to a single potential The combination regrouping all the correct statements is:

a) 2, 4
b) 1, 3, 4
c) 1, 2, 3
d) 3, 4

29. To adjust the mixture ratio of a piston engine when altitude increases, means to:

a) decrease the amount of fuel in the mixture in order to compensate for the increasing air density.
b) decrease the fuel flow in order to compensate for the decreasing air density.
c) increase the mixture ratio.
d) increase the amount of fuel in the mixture to compensate for the decreasing air pressure and density.

30. When TAS increases, the pitch angle of a constant speed propeller (RPM and MAP levers are not moved):

a) stays constant.
b) increases.
c) first reduces and after a short time increases to its previous value.
d) reduces.

31. When a part of a continuous loop fire detection system is heated: 1. its resistance decreases. 2. its resistance increases. 3. the leakage current increases. 4. the leakage current decreases. The combination regrouping all the correct statements is:

a) 1, 3
b) 2, 3
c) 1, 4
d) 2, 4

32. A propeller blade is twisted, so as to

a) decrease the blade tangential velocity from the blade root to the tip.
b) keep the local Angle of Attack constant along the blade.
c) allow a higher mechanical stress.
d) avoid the appearance of sonic phenomena.

33. A fault protection circuit in a fire detection system will:

a) inhibit the fire detector when the detection line is connected to ground.
b) automatically initiate APU shutdown and fire extinguisher striker activation in the event of fire.
c) activate an alarm in the cockpit and in the landing gear bay for ground crew.
d) activate the fire detection system when the detection line is connected to ground.

34. When quick donning masks are in use, the pilot is:

a) not able to do any radio communication.
b) only able to transmit.
c) able to radiotelephone.
d) only able to receive.

35. Regarding fire detection, Ion detectors are used to detect:

a) smoke.
b) overtemperature and fire.
c) overtemperature.
d) fire.

36. The speed of an asynchronous four-pole motor fed at a frequency of 400 Hertz is:

a) 1600 revolutions per minute.
b) 800 revolutions per minute.
c) 6000 revolutions per minute.
d) 12000 revolutions per minute.

37. For piston engines, mixture ratio is the ratio between the:

a) mass of fuel and mass of air entering the cylinder.
b) volume of fuel and volume of air entering the cylinder.
c) volume of fuel and volume of air entering the carburettor.
d) mass of fuel and volume of air entering the carburettor.

38. Static dischargers: 1. are used to set all the parts of the airframe to the same electrical potential 2. are placed on wing and tail tips to facilitate electrical discharge 3. are used to reset the electrostatic potential of the aircraft to a value approximating 0 volts 4. are located on wing and tail tips to reduce interference with the on-board radio communication systems to a minimum 5. limit the risks of transfer of electrical charges between the aircraft and the electrified clouds The combination regrouping all the correct statements is:

a) 3,4,5.
b) 2,4,5.
c) 1,3,4.
d) 1,2,5.

39. When a continuous loop wire type fire detection system is tested:

a) only the warning function is tested.
b) the whole wire is heated.
c) the wiring and the warning are tested.
d) a part of the wire is heated.

40. The wavelength of a radio signal transmitted at the frequency of 75 MHz is:

a) 75 m.
b) 7.5 m.
c) 4 m.
d) 40 m.

41. In an aircraft electrical system where AC generators are not paralleled mounted, the changeover relay allows:

a) power supply to the faulty AC generators busbar.
b) connection of the Auxiliary Power Unit (APU) to its main busbar.
c) connection of the AC generator to its distribution busbar.
d) connection of the ground power truck to its distribution busbar.

42. The alternators, when connected, are usually connected:

a) Dependant on the type of generator.
b) Dependant on the type of engine.
c) In series mode.
d) In parallel mode.

43. When the AC generators are connected in parallel, the reactive loads are balanced by means of the:

a) excitation current.
b) torque of the Constant Speed Drive (CSD).
c) voltage controller.
d) frequency or load controller.

44. The octane rating of a fuel characterises the:

a) fuel volatility
b) quantity of heat generated by its combustion
c) the anti-knock capability
d) fuel electrical conductivity

45. When increasing true airspeed with a constant engine RPM, the angle of attack of a fixed pitch propeller:

a) reduces.
b) stays constant because it only varies with engine RPM.
c) stays constant.
d) increases.

46. In the axial flow compressor of a turbo-jet engine, the flow duct is tapered. Its shape is calculated so as to:

a) maintain a constant axial speed whatever the engine rating.
b) reduce the axial speed in cruising flight.
c) maintain a constant axial speed in cruising flight.
d) reduce the axial speed, whatever the engine rating.

47. The correct formula to calculate the multi-cylinder engine displacement is:

a) cylinder length * cylinder diameter
b) piston area * piston stroke
c) piston area * piston stroke * number of cylinders
d) cylinder volume * number of cylinders

48. The safety precautions to be taken whenever using oxygen are: 1. refrain from smoking, avoid sparks. 2. Avoid operation of radio communication equipment. 3. Operate oxygen system valves slowly. 4. Avoid greasy matter. The combination regrouping all the correct statements is:

a) 1, 2, 4.
b) 1, 3, 4.
c) 1, 2, 3.
d) 2, 3, 4.

49. When a persistent underexcitation fault is detected on an AC generator connected to the aircraft mains with another AC generator, the protection device opens:

a) the tie breaker.
b) the generator breaker and the tie breaker.
c) the exciter control relay, the generator breaker and the tie breaker.
d) the generator control relay and the generator breaker.

50. A static converter is powered by:

a) alternating current on input, alternating current on output.
b) direct current on input, direct current on output.
c) alternating current on input, direct current on output.
d) direct current on input, alternating current output.

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