TECHGEN-BNC-MODULE4

TECHGEN-BNC-MODULE4

1. Consider the flight deck oxygen supply system. The purpose of the oxygen regulator (as a function of demand and altitude) is to: 1. decrease oxygen pressure from 1800 PSI (in the bottles) down to about 50-75 PSI (low pressure system) 2. supply pure oxygen 3. supply diluted oxygen 4. supply oxygen at normal pressure 5. supply oxygen at emergency/positive pressure 6. trigger the continuous cabin altitude warning at 10000 ft cabin altitude The combination regrouping all the correct statements is:

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

2. In jet transport aircraft, breathing oxygen for the cockpit is stored in the following state:

a) gaseous.
b) chemical or gaseous.
c) liquid.
d) chemical.

3. A magnetic circuit-breaker is:

a) permits an overcurrent limited in time.
b) is a system with a slow response time.
c) can be reset without any danger even when fault remains.
d) a protection system that has a quick tripping response.

4. The compressor surge effect during acceleration is prevented by the:

a) inlet guide vanes.
b) Fuel Control Unit (F.C.U.).
c) surge bleed valves.
d) variable setting type nozzle guide vanes.

5. By-pass turbine engines are mainly used in commercial aviation, because:

a) they produce less noise.
b) they are lighter than straight jet engines.
c) twin spool or triple spool jet engines require a high by pass ratio.
d) at high subsonic airspeeds they have a better propulsive efficiency than propeller or straight jet engines.

6. On the ground, the Auxiliary Power Unit (APU) can be substituted for the:

a) ground power unit.
b) ground power unit, the air conditioning unit.
c) ground power unit, the starting system.
d) ground power unit, the starting system, the air conditioning unit.

7. The VHF Omnirange (VOR) uses the following wavelengths:

a) metric.
b) decimetric.
c) hectometric.
d) centimetric.

8. The fuselage of an aircraft consists, among others, of stringers whose purpose is to:

a) integrate the strains due to pressurization to which the skin is subjected and convert them into a tensile stress.
b) provide sound and thermal isolation.
c) withstand the shear stresses.
d) assist the skin in absorbing the longitudinal traction-compression stresses.

9. On starting, in a brushless AC generator with no commutator rings, the generator is activated by:

a) the main field winding.
b) the stabilizer winding jointly with the voltage regulator.
c) a set of permanent magnets.
d) the auxiliary winding.

10. The Engine Pressure Ratio (EPR) is the ratio of:

a) the total turbine outlet pressure to the total compressor outlet pressure.
b) the total turbine inlet pressure to the total compressor inlet pressure.
c) the total turbine inlet pressure to the total compressor outlet pressure.
d) the total turbine outlet pressure to the total compressor inlet pressure.

11. A thermal circuit breaker:

a) can be reset without any danger even if the fault remains.
b) forbids any overcurrent.
c) is a protection system with a quick break capacity of about one hundredth of a second.
d) protects the system in the event of overheating, even without exceeding the maximum permissible current.

12. Landing gear torque links are used to:

a) prevent rotation of the landing gear piston in the oleo strut.
b) prevent the extension of the landing gear oleo strut rod.
c) maintain the compass heading throughout taxiing and take-off.
d) take up the lateral stresses to which the gear is subjected.

13. A tubeless tyre is a tyre: 1. which requires solid or branched wheels 2. whose valve can be sheared in sudden accelerations 3. whose mounting rim must be flawless 4. which requires no rim protection between rim flange and tire removing device 5. which does not burst in the event of a tire puncture 6. which eliminates internal friction between the tube and the tire The combination regrouping all the correct statements is:

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

14. A tubeless tyre has: 1- a built-in-air tube. 2- no built-in-air tube. 3- a crossed side casing. 4- a radial side casing. The combination of correct statements is:

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

15. The wavelength of a non-directional beacon (NDB) at a frequency of 300 kHz is:

a) 100 metres.
b) 1000 metres.
c) 1 metre.
d) 10 metres.

16. (For this question use annex 021-4008A) Reference should be made to the fuel supply system shown in annex. In flight, with centre tank empty and APU operating, a fuel unbalance is detected (quantity in tank 1 less than quantity in tank 2). Rebalancing of the two tanks is:

a) possible with "CROSSFEED" open and tank 1 pumps "OFF" and tank 2 pumps "ON".
b) impossible because there is no fuel in centre tank.
c) impossible without causing the APU to stop.
d) possible with "CROSSFEED" open and tank 2 pumps "OFF".

17. The Automatic Direction Finder uses the following wavelengths:

a) centimetric.
b) hectometric or kilometric.
c) metric.
d) decimetric.

18. On detection of a persistent overvoltage fault on an AC generator connected to the aircraft AC busbars, the on-board protection device opens:

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

19. A feeder fault on a direct current circuit results from a flux unbalance between the:

a) generator and the series winding turn.
b) shunt exciter and the series winding turn.
c) voltage coil and the series winding turn.
d) voltage coil and the series winding.

20. The purpose of a compressor bleed valve is to prevent surging:

a) generated by foreign object ingestion.
b) with altitude.
c) at low compressor rpm.
d) of the first compressor stages.

21. When a landing gear wheel is hydroplaning, its friction factor is equal to:

a) 0
b) 0.5
c) 1
d) 0.1

22. The conditions to be met to activate a shunt generator are: 1. presence of a permanent field 2. closed electrical circuit 3. generator terminals short-circuited 4. minimum rotation speed The combination of correct statements is:

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

23. When a persistent top excitation limit fault on an AC generator connected to the mains with another AC generator, the overexcitation protection device opens:

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

24. The Auxiliary Power Unit (APU) has its own AC generator that:

a) supplies the aircraft with three-phase 115-200 V, 400 Hz AC.
b) is excited by its Generator Control Unit (GCU) as soon as the APU starts up.
c) must have the same characteristics as the main AC generator so that it can be easily coupled with the latter.
d) is driven at constant speed through a Constant Speed Drive (CSD), in the same way as the main AC generator.

25. Consider a jet engine whose control is based on the Engine Pressure Ratio (EPR): 1. with a constant EPR, the thrust decreases when the altitude increases 2. with a constant EPR, the thrust is independent of the Mach number 3. At same environmental conditions, a given EPR setting maintains the thrust irrespective of engine wear due to ageing. 4. the EPR is determined by the impact pressure difference between the turbine outlet and the compressor inlet 5. on take-off, in the event of icing not detected by the crew, the indicated EPR is lower than the real EPR The combination regrouping all the correct statements is:

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

26. The advantages of alternating current on board an aircraft are: 1. simple connection 2. high starting torque 3. flexibility in use 4. lighter weight of equipment 5. easy to convert into direct current 6. easy maintenance of machines The combination of correct statements is:

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

27. To reverse the direction of rotation of shunt-type (parallel field) DC electric motor, it is necessary to:

a) connect a phase-shift capacitor to the field circuit.
b) change the connections from shunt to series.
c) reverse the polarity of the motor connections.
d) reverse the polarity of either the stator and the rotor.

28. The Distance Measuring Equipment (DME) uses the following wavelengths:

a) centimetric.
b) decimetric.
c) metric.
d) hectometric.

29. When a persistent over-excitation fault is detected on only one AC generator, the protection device opens the:

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

30. On board present aircraft, the batteries used are mainly Cadmium-Nickel. Their advantages are: 1. low risk of thermal runaway 2. high internal resistance, hence higher power 3. good charging and discharging capability at high rating 4. wider permissible temperature range 5. good storage capability 6. sturdiness owing to its metal casing 7. the electrolyte density remains unchanged during charging. The combination of correct statement is:

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

31. The capacity of an accumulator is:

a) The intensity withstood by the battery during charging.
b) The number of cycles (charging and discharging) that a battery can withstand without deterioration of its cells.
c) The no-load voltage of the battery multiplied by its rated output current.
d) The quantity of electricity that the battery can supply during discharge.

32. Consider the variable-pitch propeller of a turbo-prop. During deceleration:

a) at zero power, the propeller thrust is zero and the engine power absorbed is nil.
b) when feathered, the propeller produces thrust and absorbs no engine power.
c) with propeller windmilling, the thrust is zero and the propeller supplies engine power.
d) when braking, the propeller supplies negative thrust and absorbs engine power.

33. The chemical oxygen generator is a system: 1. which is inexpensive 2. requiring no external input 3. which is lightweight 4. requiring no maintenance 5. with adjustable flow rate 6. which is unsafe The combination regrouping all the correct statements is:

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

34. Below its design speed an axial compressor:

a) has a tendency to surge in the front stages.
b) has no tendency to surge.
c) has a tendency to surge in the centre stages.
d) has a tendency to surge in the rear stages.

35. A diluter demand oxygen regulator:

a) mixes air and oxygen in a passenger oxygen mask.
b) delivers oxygen flow only above FL 100.
c) delivers oxygen flow when inhaling.
d) is only recommended for use with smoke in the cockpit.

36. The colour of a fresh synthetic hydraulic fluids is:

a) blue.
b) pink.
c) red.
d) purple.

37. The illumination of the green landing gear light indicates that the landing gear is:

a) not in the required position.
b) locked-down and its door is locked.
c) in the required position.
d) locked-down.

38. The Instrument Landing System (ILS) uses the following wavelengths:

a) metric.
b) decimetric.
c) hectometric.
d) centimetric.

39. An aircraft with a pressurized cabin is settled at its cruise level. During the flight, a malfunction of the pressure controller is detected by the crew and the cabin rate indicator reads -200ft/min. Given that: DELTA P: Differential pressure Zc: Cabin altitude

a) A descent must be initiated to prevent the oxygen masks dropping when Zc reaches 14000ft.
b) The aircraft has to climb to a higher flight level in order to reduce Zc to its initial value.
c) The crew has to intermittently cut off the incoming air flow in order to maintain a zero Zc.
d) DELTA P will rise up to its maximum value, thus causing the safety relief valves to open.

40. The minimum airborne equipment required for operation of a the VHF direction finder is a:

a) VHF compass operating in the 200 kHz to 1750 kHz range.
b) cathode-ray tube.
c) VHF transmitter-receiver operating in the 118 MHz to 136 MHz range.
d) VHF receiver operating in the 118 MHz to 136 MHz range.

41. Shimmy occurs on the nose wheel landing gear during taxiing when: 1. the wheels tend to describe a sinusoidal motion on the ground 2. the wheels no longer respond to the pilot's actions This effect is overcome by means of: 3. the torque link 4. a damper associated with the steering cylinder The combination of correct statements is:

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

42. A "Zener" diode is used for:

a) digital displays.
b) voltage stabilization.
c) reverse current protection.
d) rectification.

43. An aircraft with a pressurized cabin flies at level 310. Following a malfunction of the pressure controller, the outflow valve runs to the open position. Given: VZc: Cabin rate of climb indication Zc: Cabin pressure altitude DELTA P: Differential pressure This will result in a:

a) VZc decrease Zc decrease DELTA P increase
b) VZc decrease Zc increase DELTA P decrease
c) VZc increase Zc increase DELTA P decrease
d) VZc increase Zc increase DELTA P increase

44. Direct current generators are connected:

a) in series to provide maximum power.
b) in parallel to provide maximum power.
c) in parallel to provide maximum voltage.
d) in series to provide maximum voltage.

45. The Low Altitude Radio Altimeter uses the following wavelengths:

a) decimetric.
b) metric.
c) centimetric.
d) myriametric.

46. The high Altitude Radio Altimeter uses the following wavelengths:

a) decimetric.
b) hectometric.
c) metric.
d) myriametric.

47. The voltage regulator of a DC generator is connected in:

a) parallel with the shunt field coil.
b) parallel with the armature.
c) series with the shunt field coil.
d) series with the armature.

48. When an underspeed fault is detected on an AC generator connected to the aircraft AC busbar, the protection device opens the:

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

49. The function of an accumulator in a hydraulic brake system is:

a) to damp pressure fluctuations of the auto brake system.
b) to store the hydraulic energy recovered by the anti skid system to prevent wheel blocking.
c) to supply a limited amount of brake energy in case the hydraulic system normally powering the brakes does not function anymore.
d) to function as a buffer to assist the hydraulic system during heavy braking.

50. The VHF direction finder uses the following wavelengths:

a) decimetric.
b) metric.
c) centimetric.
d) hectometric.

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