1. The property of material which which opposes instantaneous change of current is
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a. Inductor b. Capacitor c. Resistor d. None A Vector Quantity has a. Electric flux & Electric Voltage b. Direction & magnitude c. Magnetic Flux d. Magnetic Flux Density
3. The mutual inductance “M” between two coils having inductances L 1 and L2 and having a coupling coefficient “K” is given by the formula: a. M= K / (L1 x L2 ). 1/2 b. M= K (L1) / L2. c. M= K (L1 + L2)1/2 4.
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d. M=K√(L1xL2) In an LC tuned circuit the t he resonant frequency is given by: a. 2п x (C/L). b. 2п x (L/C). 1/2 c. 2п x (C/L) . 1/2 d. 1/2п 1/2п x (L/C) . The system which allows the cabin and the ground crew to communicate with one another is the: a. Flight interphone system. b. Cabin interphone system. c. Service interphone system d. None of the above. The purpose of the cockpit voice recorder system is to: a. Record all conversation in the cockpit. b. Record all inputs and outputs of communications on all aircraft systems. c. Retain this record in a manner t hat it is crash survivable and reproducible. d. All of the above are true. Normally when performing an operational test the frequency of _____ Hz is heard and a frequency of _________Hz is heard when performing a bulk erase: a. 600,400. b. 400,600. c. None of the above is true. Which of the following conditions typically need to be satisfied in order to perform a bulk erasure of the CVR data: a. Aircraft should be on ground. b. The parking brake should be set. c. Both a & b. d. None of the above is true. The type of modulation typically used in HF and VHF systems is: a. FM. b. AM. c. PM. d. Both a & b. e. None of the above is true. An antenna is installed in such a way that it is protruding vertically from the fuselage (up or down) of an aircraft with respect to the ground. The polarization of this antenna is: a. Vertical.
b. Horizontal. c. Both a & b. d. None of the above is true. 11. Which of the following statements is not true about the Transverse Electromagnetic waves: a. This is the mode in which electromagnetic waves t ravel in air. b. These waves travel with the speed o f light. c. Both the electric and magnetic fields are perpendicular to each other and to the direction of propagation. d. Sound is a form of TEM wave. 12. Automatic Direction Finder (ADF) provides the following information: a. Magnetic bearing from the station to the aircraft. b. Deviation from the magnetic bearing from the station to the aircraft. c. Relative bearing to the station. d. Both a & b. e. None of the above is true. 13. Very High Frequency Omni Ranging (VOR) provides the following information: a. Magnetic bearing from the station to the aircraft. b. Deviation from the magnetic bearing from t he station to the aircraft. c. Relative bearing to the station. d. Both a & b. e. None of the above is true. 14. Automatic Direction Finder (ADF) frequency channel is ____ with a channel spacing of ___________: a. 190-1750 kHz., 500 Hz. b. 108-118 MHz, 50 k Hz. c. 190-1750 MHz., 50k Hz. d. 108-118 kHz, 500 Hz. 15. The cardiod is generated by an ADF system by processing the output/s of: a. The sense antenna. b. The loop antenna. c. Summing the signal of both a & b. d. None of the above is true. 16. The marker system is used to give: a. Magnetic bearing from the station to the aircraft. b. Deviation from the magnetic bearing from the station to the aircraft. c. Relative bearing to the station. d. Both a & b. e. None of the above is true 17. The ADF loop antenna is a ____ while the sense antenna is a ____ antenna. a. Capacitive, inductive. b. Inductive, capacitive. c. This is not true since both are tuned antennae. 18. The signal from a VOR station contains: a. A reference signal which has the same phase. b. A variable signal which has an angular phase variation relative to the position of the aircraft. c. A Morse coded ident tone. d. All of the above. 19. Which of the following signals is modulated with t he carrier signal and then frequency modulated again with a 9960 Hz signal: a. A reference signal which has the same phase.
b. A variable signal which has an angular phase variation relative to the position of the aircraft. c. A Morse coded ident tone. d. All of the above. 20. Glide slope frequencies are automatically tuned when the following frequency is tuned: a. 108.10 MHz. b. 108.20 MHz. c. 113.10 MHz. d. 113.20 MHz. 21. On approaching a runway, the localizer beam on the left is modulated with a signal of ________while the right is modulated with a signal of _____ Hz. a. 150,90. b. 90,150. c. None of the above. 22. On approaching a runway, the upper glide slope beam is modulated with a signal of ________while the lower one is modulated with a signal of _____ Hz. a. 150,90. b. 90,150. c. None of the above. 23. The localizer works by:(20) a. Taking a difference between the amplitude of the two signals and finding out which one is greater. b. Monitoring the variation in the signal average power. c. Both a & b. d. None of the above is true. 24. The localizer frequency is tuned and an approach is being made. The vertical bar moves one dot to the right on the Horizontal Situation Indicator (HSI): a. The pilot should increase the height of the aircraft by half a degree. b. The pilot should decrease the height of the aircraft by half a degree. c. The pilot should move the aircraft to the right by a degree. d. The pilot should move the aircraft to the left by a degree. 25. The localizer frequency is tuned and an approach is being made. The horizontal bar moves one dot down on the Horizontal Situation Indicator (HSI): a. The pilot should increase the height of the aircraft by half a degree. b. The pilot should decrease the height of the aircraft by half a degree. c. The pilot should move the aircraft to the right by a degree. d. The pilot should move the aircraft to the left by a degree. 26. The following is not true with respect to the Instrument Landing System: (23) a. The VOR and Localizer antennae are normally co-located till the approach phase. b. The localizer and the glide slope antennae are both horizontally polarized. c. During approach the Localizer and glide slope share a common antenna. d. All of the above are true statements. 27. In a receiver noise factor F is given by. a. Signal out/signal in Noise out/noise in b. Signal out/Noise out Signal in/noise in c. Signal in/Noise in Signal out/noise out 28. A transmitter system which is radiating an interrupted RF carrier for transmitting Morse ident. a. CW. b. MCW.
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c. R/T In amplitude modulation the depth of modulation may be given by. a. M = Peak value of the carrier ×100 Peak value of modulation envelop b. M = Mean value of the carrier × 100 Mean value of modulation envelop c. D = Peak value of modulation envelop × 100 Peak value of the carrier d. D = Peak value of the carrier ×100 Peak value of modulation envelop When an RF carrier is amplitude modulated to a depth of 100%. The amplitude of single sideband is. a. 1/3 of the Peak carrier Voltage. b. ¼ of the Peak carrier Voltage. c. ½ of the carried Peak Voltage. d. Double the carrier Voltage. The overall power gain of an oscillator should be. a. Less than unity. b. Unity. c. Grater than unity. In order to oscillate, an oscillator must have. a. Positive feedback. b. Negative feedback. c. No feedback. Crystal control may be used in an o scillator circuit to. (30) a. Increase amplitude of oscillation. b. Improves oscillator stability. c. Convert negative feedback to positive feedback. The phase shift in each of the t hree steps of feedback ladder of a phase shift oscillator is:a. 90° b. 60° c. 45° The ILS operates:a. Localizer and glideslope in VHF band, marker at 75 MHz. b. Localizer and glideslope in UHF band, Marker at 75 MHz. c. Localizer in VHF band, and glideslope in UHF band and marker at 75 MHz. A modern ILS has:a. One marker. b. Two markers. c. Three markers.
37. The earth:a. Is a perfect sphere. b. Has grater diameter at the equator than between the poles. c. Has less diameter across the equator than between the poles. 38. A nautical mile is:a. One degree of an arc on any line of latitude. b. One degree of an arc on the equator. c. One minute of an arc on equator. 39. A nautical mile is:a. 6080 feet. b. 5280 feet.
c. 66/76 statute miles. 40. Doppler VOR makes use of:a. An antenna rotating 30 Hz. b. A circle of antenna fed in sequence. c. A rotating cardioids radiation pattern. 41. An aircraft is on the 150 deg. TO radial when the pilot selects a course of 330 deg. The deviation bar shows :a. Fly Right b. Fly left c. On course. 42. The VOR facility shares its receiver with : - (39) a. Both ILS localizer and glideslope. b. ILS glideslope only. c. ILS localizer only. 43. FREQUENCY OF E BAND a. Above 300 MHz for Navigation, Radio & Landings Aids b. Below 300 MHz for Navigation, Radio & Landings Aids c. Above 30 MHz for Navigation, Radio & Landings Aids d. None 44. FREQUENCY OF WEIN BRIDGE OSCILATOR a. 0.16/RC b. 0.08/RC c. π/RC d. none 45. other name of UNIPOLE ANTENNA. a. λ/4 antenna b. λ/2 antenna c. λ antenna d. none 46. other name of Half Wave Dipole Antenna a. λ/4 antenna b. λ/2 antenna c. λ antenna d. none 47. VSWR a. Vmax/Vmin OR Imax/Imin. b. Imax/Vmin OR Vmax/Imin. c. Vmin/Vmax OR Imin/Imax. d. Vmax/Imax or Vmin/Vmax 48. AVERAGE VALUE OF SINE WAVE a. Eav= 1.11E rms b. Eav=Erms/1.11 c. Eav= 0.707 Erms d. Eav=0.707Emax 49. SPACEC AND SURFACE WAVES, a. Ground Waves b. Sky Waves c. Both a & b d. None 50. MAGNETIC POLES ARE a. Moving Westerly b. Moving Easterly c. Stationary
51. IN RELATIVE BEARING AIRCRAFT NOSE SHOWS. a. 0° b. 45° c. 90° d. 180° 52. RECIPROCAL OF 175 DEGREE a. 355° b. 5° c. -175° d. -5° 53. CAPACITOR STORE ENERGY IN a. Electric Field b. Electric flux c. Electrons d. Magnetic field 54. DETECTOR OUTPUT is a. Audio Voltage b. DC Voltages c. AC Voltages d. none 55. NUMBER OF ADF USE IN MODERN AIRCRAFT a. 2 b. 3 c. 1 56. VSWR OF MISMATCHED LINE a. 0 b. 1 c. d. none ∞
57. TRANSMITION LOSSES. a. Heating Losses b. Dielectric Losses c. Skin Effect Losses d. All of the above
58. AC VALUE WHICH PRODUCE SAME HEATING EFFECT AS DC IS KNOWN AS (54) a. Effective Value b. Average Value c. Peak Value d. Peak-Peak Value 59. A Resonant Circuit is a. Inductive b. Capacitive c. Resistive d. Inductive effect is cancelled by capacitive effect e. C & D 60. AGC is used for (55) a. Ionosphere Storms b. Sun Spots c. General Fading d. Selective Fading e. All of the above
61. At Reciever side, RF amplifiers uses a. LC Tuned Ckt b. RC Tuned Ckt c. Filters d. A & C 62. Aerial Radiation Resistance Question (T/F) 63. As frequency decreases a. Xc ↑ & XL↑ b. Xc↑ & XL↓ c. Xc↓&XL↑ d. XC↓& XL↓ 64. In a RC Circuit, R=60Ω & XC=40Ω a. V lags I by angle more than 45 degree b. I lags V by angle more than 45 degree c. V lags I By angle less than 45 degree d. V lags I by angle equal to 90 degree e. V lags I by angle more than 90 degree 65. Gain of Receiver is maximum when a. Signal is weak b. Signal is strong c. Moderate signal 66. For long Bandwidth & constant input impedance aerial should be (53) a. Long b. Short c. Thick d. Thin 67. In simple Crystal circuit, Voltage amplification is done by a. RF Transformer b. Voltage Amplifier c. FET d. A & C 68. Stub is a. Short Circuit small piece of T/L b. Open circuit large piece of T/L c. Coaxial Cable with VSWR =0 d. Coaxial Cable with VSWR = 1 69. Selcall No of pulses & Tones a. 2 pulses with 1 tone each b. 2 pulses with 2 tones each c. 2 pulses with 4 tones each 70. In Yagi array __________ behind Dipole and __________ forward of dipole used a. A reflector and a Director b. Multiple reflectors and multiple directors c. A reflector & multiple directors d. Multiple Reflector and a director 71. Voltage Amplification in MOPA is done a. Between Oscillator stage and Key b. At Radio telephony stage c. Between oscillator & power amplifier stage 72. The Types of attenuation (60) a. Selective b. Spatial
c. Absorption d. B & C 73. Fluctuation in signal strength at the receiver output is called a. Fading b. Noise c. Attenuation d. None 74. The purpose of detector is a. Rectification b. Filter c. Smoothing d. Only a & b e. A, B & c 75. In S.H.D Receiver, Voltage amplification occurs at a. RF AMP b. IF AMP c. Audio AMP d. AGC
Digital Avionics 76. Serial Data Bus used in A/C a. To reduce weight of cabling b. 77. Arinc 429 when BNR is used, Negat ive values are stored as a. 2’s complement format b. 1’s complement format c. Sign bit BCD format 78. Fastest ADC is a. Flash b. Sucessive approximation c. None 79. Most comparators are used in which ADC a. Flash ADC b. Successive Approximation ADC c. None 80. Reflections from Bus is stopped by a. Bus couplers b. Bus Terminators c. Shielded cables 81. A bus in which 2 way data transfer is possible a. Asynchronous b. Bidirectional c. Syncronous d. Unidirectional 82. Refractive Index of Core is always greater than refractive index of cladding. a. True b. False 83. The advantage of using R-2R DAC is a. Accurate b. Less Noise c. Less number of resistance values 84. A DAC has maximum number of 256 ste ps of Voltage, the number bits for DAC is a. 8
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b. 128 c. 256 d. 4 Binary equivalent of 29 Decimal Value of 10110 Arinc429, Label Bits a. 1-8 b. 2-9 c. 3-10 d. 12-18 Error Checking in Arinc 429 is performed by a. CRC b. Checksum Bits c. Parity d. None TTL Noise margin Level is a. 400mV b. 200mV c. 2V CMOS IC with 12 Volts Supply, if 3 Volts are given at input a. Logic 1 b. Logic 0 c. Indeterminate Arinc469 Data encoding format is a. Analog Doublet b. Parallel Bus c. Manchester code Convert 73 into BCD Convert BCD to Decimal Arinc629 Physical media specification is a. Optical Fibre b. Coaxial c. Shielded Twisted Pair 10110 find 2’s complement In Bipolar ADC, MSB indicates a. –ve Voltage b. +Ve Voltage c. Zero Voltage
