Modulation Using Non-Linear Devices (Balanced Modulator) MCQ

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• Beam width of antenna is expressed in ________
  ক

  metres

  খ

  degrees

  গ

  radian

  ঘ

  volt
• What are the two major drawbacks of delta modulation?
  ক

  Slope Overload and Granular noise

  খ

  Slope Overload and Serration noise

  গ

  Serration noise and Granular noise

  ঘ

  Slope Overload and Channel Noise
• If a FM signal having modulation index mf is passed through a frequency tripler, then the modulation index of output of frequency tripler is ________
  ক

  mf

  খ

  3mf

  গ

  1⁄3 mf

  ঘ

  1⁄9 mf
• What is the capacitive reactance for DC signals?
  ক

  zero

  খ

  very low

  গ

  equal to one

  ঘ

  infinite
• If the spectrum of a narrow band noise is symmetrical and it has a power density spectrum 4×10-6. Power density of quadrature component is ________
  ক

  2 x 10-6

  খ

  5 x 10-6

  গ

  3 x 10-6

  ঘ

  4 x 10-6
• Any signal and its Hilbert transform have same energy density spectrum.
  ক

  True

  খ

  False
• Approximate how many times odd and even fields of television system are scanned?
  ক

  25 times each

  খ

  50 times each

  গ

  50 times each but alternately

  ঘ

  25 times each but alternately
• What is the use of SSB?
  ক

  It has lesser bandwidth

  খ

  It has large bandwidth

  গ

  It has infinite bandwidth

  ঘ

  It has zero bandwidth
• Signal to Noise ratio for a hi-fi system is equal to ________
  ক

  50 dB

  খ

  100 dB

  গ

  75 dB

  ঘ

  10 dB
• The approximate aspect ratio for television is ________
  ক

  2 : 1

  খ

  3 : 2

  গ

  4 : 3

  ঘ

  3 : 4