Paper 3 RN JUNE 2014 Rev

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DGCA PAPER - RN JUNE 2014

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Prepared & Submitted by :-PARSHANT THAKUR

1. MTCS

a) TCAS I gives Traffic Advisory(TA)

b) TCAS II gives Traffic Advisory (TA) & Resolution Advisory(RA)

c) TCAS, In RA Shows a/ position vicinity only

2. For proper propagation of wave in a waveguide wave length used is a) Less than cut off wave length b) Longer than cut off wave length c) Equal to the wave length

3. In Resolution Advisory a) Indicate potential threat in area b) Provide the path to avoid the possible collision c) As in (b) & give the exact position of the A/C d) All of these 4. In ADF a) Loop antenna is mounted near the nose, tail or near the antenna b) Sense antenna is mounted at the electric centre of the a/c c) Both 5. “REPLY” In three pulse method of Side Lobe Suppression (SLS) a) P2 ≥ P1 b) P2 ≤ P1 c) P2 ≤ P1 – 9 db

6. Ratio of Max. to Min. which is equal to SWR a) SWR = Zo/Zi b) SWR = Zi/Zo c) Both (a) & (b) which is smaller d) Both (a) & (b) which one is larger

7. In Flight Interphone if PTT is pressed a) All PA speaker are mute b) As in (a) & connect to mic c) Cockpit speaker is heard d) As in (a) & mic is connected to the line

8. Dither motor is used to eliminate in IRS used laser to a) Laser Lock b) Gimbal Lock c) No Such Motor 9. Squelch circuit a) Disable the Rx o/p when no signal is being received b) Disable the transmitter o/p when o signal is being received c) Enable the Rx o/p When signal is being received d) All of these

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10. Squelch circuit a) Disable the Rx o/p when signal is being received b) Potentiometer which allow the pilot to set the level at which the squelch open, so Allowing audio output from the Rx c) When the control is set to Maximum squelch the HI and LO squelch disable leads, brought to the control unit from the transceiver, should be shorted, so giving a definite squelch disable d) All of these

11. Bonding radio equipment to airframe will provide a) Low current path b) High current path c) High impedance ground return d) Low impedance ground return

12. The a/c heading is 50®, VOR 1shows 90® and VOR 2 shows 240® on compass card a) Relative bearing of VOR 1 is 90® b) Magnetic bearing of VOR 2 is 240® and Relative bearing is 190® c) Magnetic bearing of VOR 2 is 400® d) All of these

13. Stages of AM receiver a) RF amp, Mixer, AF amp, Detector b) AF amp, IF amp, Mixer, Detector c) Mixer, IF amp, Detector, AF amp d) Mixer, IF amp, Detector, AF amp

14. Cause of Duct formation in microwave propagation a) Temperature inversion b) Attenuation c) Reflection d) all

15. What is normally used to bond non continuous stainless steel aircraft components? a) Stainless steel jumpers b) Copper jumpers c) Aluminium jumpers

16. In EICAS system caution amber light indicate a) Level B b) Level C c) Level A 17. IF stages used in FM receiver a) Convert input frequency into fix frequency.. b) Convert output frequency into fix frequency c) Convert input frequency into output frequency

18. GPWS Mode 1 warning a) Sink Rate Sink Rate, Pull Up Pull Up light on or Whoop Whoop pull up pull up light on b) Sink Rate Sink Rate Pull Up Light Off c) No Warning

19. On large a/c wire antenna is not used the notch antenna is used in the a/c structure which acts as inductance in a) Parallel resonated by HV variable capacitor




b) Series resonated by HV variable capacitor c) Both (a)&(b)

20. Static Discharger is used to precipitate a) low current after corona effect b) low current before corona effect 21. MTCS a) Communication satellite appear to hover in given spot above the equator b) as in (a) and they are stationary c) Satellite is not a microwave repeater

22. In Fly By Wire technology a) Is the system where the control surface are moved mechanically b) Where the data control the surface are moved electronically c) the signal to control the control surface movement are transmitted electrically through the wire

23. One of the major advantage of using the a/c electrical power in the a/c is a) AC motor can be reversed while DC motor cannot be b) That the effective voltage is 1.414 times the maximum instantaneous voltage c) Greater ease in step up or step down the voltage

24. What is the range of VHF with station being at the sea level and the a/c being the height of 1000ft a) 246nm b) 123nm c) 136nm 25. In the battery a) Capacity of the battery will be decrease if load is increased b) The battery being discharged at two ampere hour can be compared the battery with unknown charge but with same capacity c) With the decrease of temperature, the capacity of battery will decrease d) None

26. The battery with the 13.75 volts supply to the antenna, the current of 0.1A, with 6v drops in the aerial unit . What is the voltage dropped at the aerial unit a) 13.75 b) 10v c) 13.60v d) 13.15v

27. Which system is not provide interface unit to all other related a/c system for an Aviation satellite a) AFCU b) SDU c) FDU

28. The stability of the carrier frequency at the VHF system is a) ±.005% b) ±.05% c) ±.50% d) Any of the above

29. Calculate the Doppler shift, if the velocity of the RF energy is C and the velocity of the a/c with V making the angle Ô by the beam with ground




a) Fd = (2vf cos Ô ) b) Fd = (2vf sin Ô) c) Fd = (2vfCosec Ô)

30. SWR means a) It will be determined by the forward wave travelling in the transmission line with the reflected wave having no significance in its calculation b) The VSWR of the broad band antenna will be less as they can be operated over wide range of frequency c) IF the correct transition line is used the VSWR will be constant without dependent on load d) All of these

31. When the combine VOR & VHF antenna are used a) Vertical portion of the antenna use for VHF communication b) A + Provide vertical polarization c) V pointed antenna used for VOR & VHF communication d) B + Provide horizontal polarization

32. ELT activated by a) Parallel to the longitudinal axis of the a/c b) Perpendicular to the longitudinal axis of the a/c c) Both

33. Hot microphone in the CVR a) Connected to FDR for any control selection b) Connected to the pilot switch to make desire selection c) Connected to CVR for any control selection

34. Advantages of optical couplers a) Single fibre can handle less channels b) Light weight and non corrosiveness of fibre make it very practicable to a/c use c) The spacing of repeaters up to 80 km d) Both B & C

35. When AC & DC, interesting this point is known as a) Operating point b) Way point c) Cutting point d) None of the above

36. Mark the correct statement, ADF loop alignment error a) Quadrental error effect the bearing indication b) A+ arise from the radio frequency current circulation in the metal structure of the aircraft

37. MTCS a) Bite tester used for internal check-up of aircraft component specification by manufacturer b) Ramp tester is used for external checking up aircraft components specified by manufacturer c) B + Person should be authorized for testing d) C + Do not use extend ramp tester unless specified by manufacturer

38. MTCS regarding Radio Altimeter a) Both Altimeter waves can be transmit from a single antenna b) Both transmit on same frequency




c) Reading may be effect due to interference d) All of these

39. Half ADDER consist a) XOR + AND b) XOR + NAND c) XOR + OR their input connected parallel

40. In ILS system Lateral guidance in CDI a) Localizer b) Marker Beacon c) Glideslope d) All of these

41. In HF communication system clarifier used to a) Re- inserted career frequency b) Increase coverage area c) A + Use as highly accurate and stable frequency synthesizer make it provision unnecessary

42. Padding Capacitor used in a) Tracking b) GPS c) HF amplifier d) Oscillators

43. Which motor not suitable for a/c due to high torque a) Shunt Wound b) Compound Wound c) Series Wound

44. In HF system it is working at only one frequency, the possibility of fault is in a) Transmitter b) Antenna c) ATU

45. Which is the best transformer connection suited for 3 phase- 4 wire a) Delta- Delta b) Star- Delta c) Delta- Star d) Star- Star

46. Glideslope d.d.m at centre line a) 0® & 40® depth b) 0® & 20® depth c) .155 & 20® depth d) .155 & 40® depth

47. Major part of the current in an semiconductor a) Conduction Band Electron b) Valance Band Electron c) Holes in Valance Band d) Thermally generated band

48. BJT operation in Cut off region a) Vce = 0 b) Vce= Vcc




c) Vce has negative value d) Ic is max

49. M’ARRAY radiation below ………….. elevation a) 0.3® b) 0.5® c) 0.8® d) 1.0®

50. Over modulation occur signal amplitude is ………..career amplitude a) Equal b) Less c) Greater d) One half of the career amplitude

51. MOSFET is sometimes called……………..JFET a) Many gate b) Open gate c) Insulation gate d) Shorted gate 52. An SCR can control over………….of A.C supply a) Positive half cycle b) Negative half cycle c) Both Positive half cycle and Negative half cycle d) Positive half cycle and Negative half cycle 53. Tail current in Differential Amplifier a) Adding of two emitter current b) Difference of two emitter current c) Collector current d) Collector voltage

54. When the jumper for radio noise prevention only, a resistance ……….ohm is satisfactory a) 0.01 ohm b) 0.001 ohm c) 1.0 ohm d) 1 to 2 ohm

55. Precipitation static is a general term applied to noise in radio receiving system cause by a) Dust only b) Dust, sand only c) By airborne equipment only d) Dust, sand and by airborne equipment

56. Min value of characteristics impedance of air dielectric parallel ……wire line have a) 23 b) 43 c) 63 d) 83

57. To Avoid difficulty with strapping at HF, the type of cavity structure used a) Hole & slot b) Slot c) Vane d) Rising sun




58. Mode in EGPWS, uses weather radar to detect wind shear a) 4 b) 5 c) 6 d) 7

59. EGPWS, Terrain caution warning colour a) Red b) Yellow c) Magenta d) Black

60. In DME, The relation of Time Of Station (TTS),Slant range(DST) and Ground Speed(KTS) a) DST = TTS + KTS b) TTS = DST + KTS c) TTS = DST X KTS d) DST = KTS X TTS 61. Spoking in weather radar is a) Icing b) Ground or Sea Water 62. If reverse voltage increase, then junction capacitance a) Decrease b) Increase c) Same stage d) Has more Band width

63. Input Impedance is highest a) CE b) CC c) CB d) None

64. In case of two Radio altimeter system installed, will indicate below ZERO a) Antenna is installed aft the main wheel b) Antenna is installed far the main wheel

65. In SSR system communication?66. True for Doubler Stub Method?67. Protective Device used radio equipment installation?68. Bonding of Radio equipment, the resistance value of the connection is a) 0.3 ohm b) 0.03 ohm c) 0.003 ohm d) 3 ohm

69. Optimum performance of Radio system?70. Optimum performance of ADF System?[[{{ Dear Followers If you have previous year DGCA question papers or other useful data then you cansubmit your question papers or data (with your name and details) here at ” [email protected] ” oryou can share on facebook also and help other students in their exam preparation. We will publish urdocument on our webpage with your name and details within 24 hr."You feel good because you're helping others, and the others feel good because they're getting help.”




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Paper 3 RN JUNE 2014 Rev