Communication Engineering MCQs with answers Page - 51

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Q. In frequency modulation ?

  • (A) Carrier signal frequency varies with the amplitude of modulating signal
  • (B) Carrier signal amplitude varies with the frequency of modulating signal
  • (C) Carrier signal amplitude varies with the amplitude of modulating signal
  • (D) Carrier signal frequency varies with the frequency of modulating signal

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Q. As the modulation index of an FM signal with sinusoidal modulation is increased from zero to two, the power in the carrier component will ?

  • (A) Decrease continuously
  • (B) Increase continuously
  • (C) First increase, becomes zero and then decrease
  • (D) First decrease, become zero and then increase

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Q. VSB modulation is preferred in TV because ?

  • (A) If reduces the bandwidth requirement to half
  • (B) If avoids phase distortion at low frequencies
  • (C) If results in better reception
  • (D) None of the other options

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Q. Which of the following statement is correct ?

  • (A) Bandwidth of FM signal is equal to AM signal
  • (B) Bandwidth of FM signal can be more or less than AM signal
  • (C) Bandwidth of FM signal is lesser than AM signal
  • (D) Bandwidth of FM signal is larger than AM signal

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Q. Which of the following modulation scheme is most band width efficient ?

  • (A) Am
  • (B) FM
  • (C) PM
  • (D) SSB-SC

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Q. With increase in modulation index: ?

  • (A) Transmitted power increases in both FM and AM
  • (B) Transmitted power decreases in both FM and AM
  • (C) Transmitted power remain constant in FM but increases in AM
  • (D) Transmitted power remain in AM but increases in FM

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Q. A balanced modulator is used for generation of which of the following ?

  • (A) DSB-SC signal
  • (B) FM signal
  • (C) PM signal
  • (D) PAM signal

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Q. Modulation is primarily accomplished to ?

  • (A) Produce side bands
  • (B) Mix two-waves of different frequencies
  • (C) Improve transmission efficiency
  • (D) Transmit audio-frequency signal over long distance

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Q. If modulation index is 0.8 then what will be the transmission power efficiency for a tone modulated signal ?

  • (A) 24.24%
  • (B) 11.11%
  • (C) 33.33%
  • (D) 21.95%

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Q. Percentage modulation of an AM wave having a power content of 8 KW at carrier frequency and 2 KW in each of its side bands is: ?

  • (A) 60%
  • (B) 70%
  • (C) 100%
  • (D) 80%

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