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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 4 of 17 pages
Question 31. Skip distance depends on time of day and angle of incidence.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 32. It is found that a ship to ship communication suffers from fading. This can be avoided by using
  1.    Space diversity
  2.    Frequency diversity
  3.    Broad band antenna
  4.    Directional antenna
 Discuss Question
Answer: Option B. -> Frequency diversity
Question 33. A buffer amplifier is
  1.    A double-tuned amplifier
  2.    A high gain D.C. amplifier
  3.    A cathode follower stage
  4.    None of the above
 Discuss Question
Answer: Option B. -> A high gain D.C. amplifier
Question 34. SSB can be generated by
  1.    Filter method
  2.    Phase cancellation method
  3.    Good attenuation characteristics
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 35. What is the purpose of peak clipper circuits in radio transmitters?
  1.    To prevent overmodulation
  2.    To reduce bandwidth
  3.    To increase bandwidth
  4.    To regulate oscillator I/P voltage
 Discuss Question
Answer: Option A. -> To prevent overmodulation
Question 36. The direction of rotation of a CD is
  1.    Clockwise
  2.    Anticlockwise
  3.    Clockwise or anticlockwise depending on frequency of data stored
  4.    Mostly anticlockwise but some times clockwise
 Discuss Question
Answer: Option B. -> Anticlockwise
Question 37. A woofer should be fed from the input through a
  1.    Low pass filter
  2.    High pass filter
  3.    Band pass filter
  4.    Band stop filter
 Discuss Question
Answer: Option A. -> Low pass filter
Question 38. In EM waves, polarization
  1.    Is always vertical in an isotropic medium
  2.    Is caused by reflection
  3.    Is due to transverse nature of waves
  4.    Results from longitudinal nature of waves
 Discuss Question
Answer: Option C. -> Is due to transverse nature of waves
Question 39. The characteristic impedance of a twin wire feeder used for TV signals is about
  1.    1000 ohm
  2.    500 ohm
  3.    300 ohm
  4.    100 ohm
 Discuss Question
Answer: Option C. -> 300 ohm
Question 40. The frequency range of 300 kHz to 3000 kHz is known as
  1.    Low frequency
  2.    Medium frequency
  3.    High frequency
  4.    Very high frequency
 Discuss Question
Answer: Option B. -> Medium frequency

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