Communication Engineering MCQs with answers Page - 48

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Admin • 833.24K Points
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Q. For a short wave radio link between two stations via the ionosphere, the ratio of the maximum usable frequency to the critical frequency ?

  • (A) Is always less than
  • (B) May be 1depending on the distance between the two stations
  • (C) Is always greater than 1
  • (D) Does not depend on the distance between the two stations

A

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Q. Radio frequency noise is valid for all of the following except ?

  • (A) Mixer stage
  • (B) If stage/IF
  • (C) Baseband recording system
  • (D) Preamplifier of radio receiver

A

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Q. Find the modulation index given : a. single tone modulation. b. positive RF peaks of an AM voltage rise to a maximum value of 8 V and drop to a minimum value of 4V ?

  • (A) 1/3
  • (B) 3
  • (C) 1/2
  • (D) 1/4

A

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Q. An AM wave is given by s(t) = 20(1+0.5 Cos cos cos 106t), the modulation index of the envelope is ?

  • (A) 0.5
  • (B) 0.58
  • (C) 0.3
  • (D) 0.8

A

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Q. For identical total transmitted power, the ratio of S/N for wide band FM to S/N of DSB-AM (with ) is : (given fm =15 KHz & frequency deviation = ) ?

  • (A) 112.5
  • (B) 300
  • (C) 75
  • (D) 450

A

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Q. A message signals given by m (t) = (1/2) Cos ( )-(1/2) sin ( ) amplitude modulated with a carrier of frequency to generate s (t) = [1+m (t)] Cos ( ). What is the power efficiency achieved by this modulation scheme ?

  • (A) 8.33%
  • (B) 11.11%
  • (C) 20%
  • (D) 25%

A

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Q. In which modulation system, when modulating frequency is doubled, the modulation index also becomes double ?

  • (A) AM
  • (B) FM
  • (C) PM
  • (D) None of the above

A

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Q. In phase modulation, phase deviation is proportional to ?

  • (A) Carrier phase
  • (B) Message signal
  • (C) Carrier amplitude
  • (D) Message signal frequencies

A

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Q. Capture effect is a characteristic of ?

  • (A) AM system
  • (B) FM system
  • (C) PCM system
  • (D) TDM system

A

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Q. A spectrum analyses is a device to ?

  • (A) Display waveform of the signal
  • (B) Read highest frequency component of the signal
  • (C) Display all frequency components of the input signal along with their amplitude
  • (D) Measure electrical signal

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