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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 10 of 17 pages
Question 91. 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 92. SSB can be generated by
  1.    Good attenuation characteristics
  2.    Filter method
  3.    Phase cancellation method
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 93. A buffer amplifier is
  1.    A cathode follower stage
  2.    A high gain D.C. amplifier
  3.    A double-tuned amplifier
  4.    None of these
 Discuss Question
Answer: Option B. -> A high gain D.C. amplifier
Question 94. What is the purpose of peak clipper circuits in radio transmitters?
  1.    To regulate oscillator I/P voltage
  2.    To reduce bandwidth
  3.    To increase bandwidth
  4.    To prevent overmodulation
 Discuss Question
Answer: Option D. -> To prevent overmodulation
Question 95. The characteristic impedance of a twin wire feeder used for TV signals is about
  1.    100 ohm
  2.    500 ohm
  3.    1000 ohm
  4.    300 ohm
 Discuss Question
Answer: Option D. -> 300 ohm
Question 96. In EM waves, polarization
  1.    Is caused by reflection
  2.    Is due to transverse nature of waves
  3.    Results from longitudinal nature of waves
  4.    Is always vertical in an isotropic medium
 Discuss Question
Answer: Option B. -> Is due to transverse nature of waves
Question 97. A woofer should be fed from the input through a
  1.    Band stop filter
  2.    High pass filter
  3.    Low pass filter
  4.    Band pass filter
 Discuss Question
Answer: Option C. -> Low pass filter
Question 98. The direction of rotation of a CD is
  1.    Anticlockwise
  2.    Clockwise
  3.    Mostly anticlockwise but some times clockwise
  4.    Clockwise or anticlockwise depending on frequency of data stored
 Discuss Question
Answer: Option A. -> Anticlockwise
Question 99. The frequency range of 300 kHz to 3000 kHz is known as
  1.    Very high frequency
  2.    Medium frequency
  3.    Low frequency
  4.    High frequency
 Discuss Question
Answer: Option B. -> Medium frequency
Question 100. Fourier analysis indicate that a square wave can be represented as
  1.    A fundamental sine wave and harmonics
  2.    A fundamental sine wave and odd harmonics
  3.    Fundamental and subharmonic sine waves
  4.    A fundamental sine wave and even harmonics
 Discuss Question
Answer: Option B. -> A fundamental sine wave and odd harmonics

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