Satellite Communication

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1)   The total bandwidth of a typical multipurpose satellite is

  • [A] 4 MHz
  • [B] 50MHz
  • [C] 300MHz
  • [D] 500MHz

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500MHz

2)   Which one of the following is capable of giving the highest data speed ?

  • [A] Coaxial cable link
  • [B] Microwave LOS link
  • [C] Microwave Satellite link
  • [D] Optical Fiber link

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Optical Fiber link

3)   The baud rate is

  • [A] always equal to the bit transfer rate
  • [B] equal to twice the bandwidth of an ideal channel
  • [C] not equal to the signalling rate
  • [D] equal to one half the bandwidth of ideal channel

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equal to twice the bandwidth of an ideal channel

4)   The use of non uniform quantisation leads to

  • [A] reduction in transmission bandwidth
  • [B] increase in maximum SNR
  • [C] increase in SNR for low level signals
  • [D] simplification of quantization process

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increase in SNR for low level signals

5)   The bit rate of a digital communication system is 34 Mbit/sec . The modulation scheme is QPSK. The baud rate of the system is

  • [A] 68 Mbit/sec
  • [B] 34 Mbit/sec
  • [C] 17 Mbit/sec
  • [D] 8.5 Mbit/sec

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68 Mbit/sec

6)   The noise figure of a receiver is 1.6 . Its equivalent noise temperature is

  • [A] 464.00 K
  • [B] 174.00 K
  • [C] 108.75 K
  • [D] 181.25 K

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174.00 K

7)   The function of telegraph repeater is

  • [A] To repeat the signal
  • [B] To amplify the signal
  • [C] To amplify the signal and eliminate the distortion in the signal
  • [D] Demodulate the signal

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To amplify the signal and eliminate the distortion in the signal

8)   No picture , No sound , No raster trouble is in

  • [A] Vertical Oscillator
  • [B] RF Amplifier
  • [C] Horizontal Oscillator
  • [D] Video Amplifier

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Horizontal Oscillator

9)   Orbit height , H for a satellite is given by

  • [A] H = (r km - 6370) km
  • [B] H = (r km + 6370) km
  • [C] H = r km
  • [D] None of these

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H = r km

10)   A communication satellite is a repeater between

  • [A] a transmitting station and a receiving station
  • [B] a transmitting station and many receiving stations
  • [C] many transmitting stations and many receiving stations
  • [D] None of these

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many transmitting stations and many receiving stations

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