Communication Engineering MCQs | Page - 51

Dear candidates you will find MCQ questions of Communication Engineering here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.

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
💬 Discuss
✅ Correct Answer: (D) Carrier signal frequency varies with the frequency of modulating signal

Published by Gopal Sharma ⭐ 38.32K Points at 12-Sep-2020 08:44 am in Communication Engineering

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
💬 Discuss
✅ Correct Answer: (A) Decrease continuously

Published by Gopal Sharma ⭐ 38.32K Points at 12-Sep-2020 08:44 am in Communication Engineering

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
💬 Discuss
✅ Correct Answer: (A) If reduces the bandwidth requirement to half

Published by Priyanka Tomar ⭐ 35.28K Points at 16-Jul-2020 12:25 am in Communication Engineering

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
💬 Discuss
✅ Correct Answer: (D) Bandwidth of FM signal is larger than AM signal

Published by Ranjeet ⭐ 34.60K Points at 21-Jul-2020 03:01 pm in Communication Engineering

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

  • (A) Am
  • (B) FM
  • (C) PM
  • (D) SSB-SC
💬 Discuss
✅ Correct Answer: (D) SSB-SC

Published by Sandhya Thakur ⭐ 4.08K Points at 16-Jan-2025 01:03 am in Communication Engineering

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
💬 Discuss
✅ Correct Answer: (C) Transmitted power remain constant in FM but increases in AM

Published by Vijay Sangwan ⭐ 28.62K Points at 30-May-2023 11:44 pm in Communication Engineering

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
💬 Discuss
✅ Correct Answer: (A) DSB-SC signal

Published by Vijay Sangwan ⭐ 28.62K Points at 30-May-2023 11:44 pm in Communication Engineering

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
💬 Discuss
✅ Correct Answer: (D) Transmit audio-frequency signal over long distance

Published by Praveen Singh ⭐ 36.81K Points at 14-Jun-2020 11:59 am in Communication Engineering

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%
💬 Discuss
✅ Correct Answer: (A) 24.24%

Published by Pooja ⭐ 4.41K Points at 01-Dec-2024 05:30 pm in Communication Engineering

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%
💬 Discuss
✅ Correct Answer: (C) 100%

Published by Rakesh Kumar ⭐ 28.44K Points at 15-Jul-2020 08:39 am in Communication Engineering

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