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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 8 of 17 pages
Question 71. For telegraphy the most commonly used modulation system is
  1.    FSK
  2.    Two tone modulation
  3.    PCM
  4.    Single tone modulation
 Discuss Question
Answer: Option A. -> FSK
Question 72. The main function of a balanced modulator is to
  1.    Produce balanced modulation of a carrier wave
  2.    Produce 100% modulation
  3.    Suppress carrier signal in order to create a single-sideband or double sideband
  4.    Limit noise picked by a receiver
 Discuss Question
Answer: Option B. -> Produce 100% modulation
Question 73. In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then
  1.    Amplitude of distant sidebands decreases
  2.    Amplitude of distant sidebands increases
  3.    Amplitude of distant sidebands remains constant
  4.    Amplitude of distant sidebands first increases, then decreases
 Discuss Question
Answer: Option B. -> Amplitude of distant sidebands increases
Question 74. Full duplex operation permits transmission in both directions at the same time.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 75. The colour of an object is decided by
  1.    The reflected colour
  2.    The wavelength transmitted through it
  3.    Reflected colour for opaque object and wavelength transmitted through it for transparent objects
  4.    None of the above
 Discuss Question
Answer: Option C. -> Reflected colour for opaque object and wavelength transmitted through it for transparent objects
Question 76. Which of the following is a digital modulation technique?
  1.    PCM
  2.    PSK
  3.    DM
  4.    All
 Discuss Question
Answer: Option B. -> PSK
Question 77. Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation.
  1.    Both A and R are correct and R is correct explanation of A
  2.    Both A and R are correct but R is not correct explanation of A
  3.    A is correct but R is wrong
  4.    A is wrong but R is correct
 Discuss Question
Answer: Option B. -> Both A and R are correct but R is not correct explanation of A
Question 78. PAM stands for
  1.    Pulse Analogue Modulation
  2.    Phase Analogue Modulation
  3.    Pulse Amplitude Modulation
  4.    Phase Amplitude Modulation
 Discuss Question
Answer: Option C. -> Pulse Amplitude Modulation
Question 79. Which of the following does not cause losses in optical fibre cables?
  1.    Stepped index operation
  2.    Impurities
  3.    Microbending
  4.    Attenuation in glass
 Discuss Question
Answer: Option A. -> Stepped index operation
Question 80. In a FM receiver, amplitude limiter
  1.    Amplifiers low frequency signals
  2.    Reduces the amplitude of signals
  3.    Eliminates any change in amplitude of received FM signals
  4.    None of the above
 Discuss Question
Answer: Option C. -> Eliminates any change in amplitude of received FM signals

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