TECHGEN-BNC-MODULE5

TECHGEN-BNC-MODULE5

1. The voltage of a fully charged lead-acid battery cell is:

a) 1,8 volts.
b) 1,4 volts.
c) 2,2 volts.
d) 1,2 volts.

2. The reason for using inverters in an electrical system is ..

a) To avoid a short circuit.
b) To change AC into DC.
c) To change DC into AC.
d) To change the DC voltage.

3. In the response curve of an amplifier, the bandwidth is:

a) The frequency band corresponding to maximum gain less 3 decibels.
b) The frequency band corresponding to maximum gain less 20 decibels.
c) The frequency band corresponding to maximum gain, increased by 10 kHz at each end.
d) The frequency band corresponding to maximum gain.

4. The hydraulic device similar to an electronic diode is a:

a) flow control valve.
b) distribution valve.
c) check valve.
d) shutoff valve.

5. On a non-stressed skin type wing, the wing structure elements which take up the vertical bending moments Mx are:

a) the ribs.
b) the skin.
c) the webs.
d) the spars.

6. The ice protection system currently used for the most modern jet aeroplanes is the

a) Electrical de-icing system.
b) Liquid de-icing system.
c) Hot air system.
d) Pneumatic system with expandable boots.

7. In a steep turn to the left, when using spoilers â€¦

a) The right aileron will descend, the left one will ascend, the right spoiler will extend and the left one will retract.
b) The right aileron will descend, the left one will ascend, the right spoiler will retract and the left one will extend.
c) The right aileron will ascend, the left one will descend, the right spoiler will extend and the left one will retract.
d) The right aileron will ascend, the left one will descend, the right spoiler will retract and the left one will extend.

8. The function of the selector valve is to:

a) select the system to which the hydraulic pump should supply pressure.
b) communicate system pressure to either side of an actuator.
c) discharge some hydraulic fluid if the system pressure is too high.
d) automatically activate the hydraulic system.

9. The working principle of the anti-skid system is:

a) Increase of the brake pressure at the faster turning wheels.
b) Reduction of the brake pressure at the slower turning wheels.
c) Increase of the brake pressure at the slower turning wheels.
d) Reduction of the brake pressure at the faster turning wheels.

10. A relay is:

a) An electrical energy conversion unit.
b) An electromagnetically operated switch.
c) A switch specially designed for AC circuits.
d) An electrical security switch.

11. In computer technology, an input peripheral is a:

a) hard disk drive
b) diskette drive
c) printer
d) keyboard

12. On an aircraft, the Krueger flap is a:

a) leading edge flap close to the wing tip
b) trailing edge flap
c) leading edge flap close to the wing root
d) leading edge flap

13. Flutter results from two deformation modes which are:

a) bending an elongation
b) torsion and bending
c) torsion and shearing
d) shearing and elongation

14. The vapour lock is:

a) The exhaust gases obstructions caused by an engine overheating.
b) A stoppage in a fuel feeding line caused by a fuel vapour bubble.
c) The effect of the water vapour bubbles in the induction manifold caused by the condensation.
d) The abnormal mixture enrichment caused by a greater gasoline vaporisation in the carburettor.

15. The cross-feed fuel system is used to:

a) allow the fuel to be quickly thrown away in case of emergency
b) feed every engine from any fuel tank.
c) automatically fill every tank up to the desired level.
d) allow the unusable fuel elimination.

16. Assume a constant speed DC generator providing a constant output voltage. If the electrical load increases, the voltage regulator will:

a) maintain the intensity of the excitation current constant.
b) decrease the intensity of the excitation current.
c) change the direction of the excitation current.
d) increase the intensity of the excitation current.

17. Among the different types of aircraft structures, the shell structures efficiently transmit the: 1. normal bending stresses 2. tangent bending stresses 3. torsional moment 4. shear stresses The combination regrouping all the correct statements is:

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

18. In computer technology, a storage peripheral is a:

a) hard disk drive
b) screen unit
c) printer
d) key board

19. The so-called "hot buses" or "direct buses" are:

a) kept in operating conditions by an electrical resistance in the case of energy failure.
b) providing an alternative current.
c) automatically connected to the battery if generators have failed.
d) directly connected to the battery.

20. The aircraft hydraulic system is designed to produce:

a) high pressure and small flow.
b) small pressure and large flow.
c) small pressure and small flow.
d) high pressure and large flow.

21. The modern anti-skid processes are based on the use of a computer whose input data is: 1. idle wheel speed (measured) 2. braked wheel speed (measured) 3. brake temperature (measured) 4. desired idle wheel train slipping rate 5. tire pressure The combination regrouping all the correct statements is:

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

22. The type of windings commonly used in DC starter motors are:

a) series shunt wound.
b) shunt wound.
c) series wound.
d) compound wound.

23. The component that converts hydraulic pressure into linear motion is called:

a) A Pressure regulator.
b) An actuator or jack.
c) A hydraulic pump.
d) An accumulator.

24. The most widely used electrical frequency in aircraft is:

a) 400 Hz.
b) 60 Hz.
c) 200 Hz.
d) 50 Hz.

25. The rating of electrical fuses is expressed in:

a) volts.
b) ohms.
c) amperes.
d) watts.

26. Maximum power output and low mass of aeroplane hydraulic systems can be achieved with

a) high system pressure and low volume flow.
b) medium system pressure and high volume flow.
c) medium system pressure and low volume flow.
d) low system pressure and high volume flow.

27. The purpose of static wick dischargers is to:

a) be able to fly higher because of less electrical friction.
b) dissipate static charge from the aircraft skin after landing.
c) provide a path to ground for static charges when refuelling.
d) dissipate static charge of the aircraft in flight thus avoiding radio interference as a result of static electricity.

28. During flight, the wing anti-ice system has to protect

a) the whole upper wing surface and the flaps.
b) the whole leading edge and the whole upper wing surface.
c) a part of the whole leading edge.
d) slats and the leading edge flaps only.

29. (For this question use annex 021-5248A) The hydraulic systems which works correctly is shown in the figure:

a) Figure c)
b) d
c) a
d) b

30. 'Fail safe construction' is:

a) A simple and cheap type of construction.
b) A type of construction for small aircraft only.
c) A construction which is suitable for aerobatic flight.
d) A type of construction in which the load is carried by other components if a part of the structure fails.

31. The type of hydraulic fluid which has the greatest resistance to cavitation is:

a) Mineral oil based fluid.
b) Vegetable oil based fluid (caster oil).
c) Water and glycol based fluid.
d) Synthetic fluid.

32. Batteries are rated in:

a) Watts.
b) Ohms.
c) Ampere hours.
d) Amperes/volts.

33. The purpose of an accumulator in a hydraulic system is:

a) to damp the fluid pressure variations.
b) to bypass the pumps in the hydraulic system.
c) to eliminate the fluid flow variations.
d) to enable the starting of hydraulic devices.

34. Torsion in a wing can be caused by

a) Wing tip vortex
b) Dihedral
c) Positive sweep
d) Propwash

35. (For this question use annex 021-4960A) Automatic temperature control of the system as shown, would be accomplished by:

a) automatic control of the ram air.
b) the temperature selector only modulating the mix valve.
c) the cabin sensors only modulating the mix valve.
d) the temperature selector in conjunction with cabin sensors and the temperature regulator, modulating the mix valve.

36. A relay is:

a) a unit that is used to convert electrical energy to heat energy.
b) another name for a solenoid valve.
c) a magnetically operated switch.
d) a device that is used to increase electrical power.

37. VLE is the maximum:

a) speed authorized in flight
b) speed with flaps extended in a given position
c) speed at which the landing gear can be operated with full safety
d) flight speed with landing gear down

38. The essential difference between aircraft AC alternators and DC generators (dynamos) is that the:

a) alternators supply all of the output current through the commutators and brush assemblies.
b) induced windings of the alternators are rotating (rotor), and the dynamos have a rotary inductor coil.
c) induced (output) windings of the alternators are fixed (stator), and the dynamos have a fixed inductor (field) coil.
d) The alternators generate much less power than DC generators.

39. What is (are) the damping element(s) in a landing gear shock absorber used on larger aircraft?

a) Nitrogen and a viscous liquid.
b) Nitrogen.
c) Oxygen.
d) Springs.

40. VLO is the maximum:

a) flight speed with landing gear down.
b) speed with flaps extended in a given position.
c) cruising speed not to be exceeded except in still air with caution.
d) speed at which the landing gear can be operated with full safety.

41. In an alternator rotor coil you can find:

a) Three-phase AC.
b) Only induced current.
c) DC.
d) AC.

42. The accumulator in a hydraulic system works as

a) a pressure storage.
b) a fluid storage.
c) a volume storage.
d) an energy storage.

43. In flight, if the constant speed drive (CSD) temperature indicator is in the red arc the:

a) pilot must disconnect it, and the generator is not available for the rest of flight.
b) pilot has to throttle back.
c) pilot can disconnect it to allow it to cool and use it again.
d) pilot must disconnect it and manually control the alternator.

44. Parameters to monitor a hydraulic system in the cockpit can be:

a) Pressure and fluid viscosity.
b) Pressure and hydraulic pump output.
c) Pressure, fluid temperature and quantity.
d) Pressure and RPM of the hydraulic pump.

45. In some aircraft, there is a protection device to avoid the landing gear being inadvertently retracted on the ground. It consists of:

a) An aural warning horn.
b) A warning light which is activated by the WOW (Weight On Wheels) sensor system.
c) A bolt.
d) A latch located in the landing gear lever.

46. The fuel system boost pumps are used to:

a) avoid the bubbles accumulation and feed the lines with fuel for directing it to the engine at a positive pressure.
b) feed the fuel control units, which inject the pressurized fuel into the engine.
c) feed the lines with fuel for directing it to the engine at a positive pressure.
d) avoid the bubbles accumulation.

47. It may be determined that an aircraft is not properly bonded if:

a) there is heavy corrosion on the fuselage skin mountings.
b) there is interference on the VOR receiver.
c) static noises can be heard on the radio.
d) a circuit breaker pops out.

48. The capacitance type fuel gauging system indicates the fuel quantity by measuring the:

a) density variation of the fuel.
b) electrical resistance change.
c) dielectric change between fuel and air.
d) resistivity variation of the fuel.

49. The output of a generator is controlled by:

a) varying the speed of the engine.
b) varying the field strength.
c) the reverse current relay circuit breaker.
d) varying the length of wire in the armature windings.

50. The fuel system boost pumps are submerged in the fuel ..

a) Because their efficiency is greater.
b) To cool the pumps.
c) To prime the pumps.
d) To shorten the fuel lines, so minimising the pressure losses.

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