Modulation & Demodulation(Electrical Engineering Questions ) Questions and Answers

Question 1. In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________________?
  1.    The difference frequency is closer to oscillator frequency
  2.    Lower frequencies are easier to amplify
  3.    Only the difference frequency can be modulated
  4.    None of the above
Explanation:-
Answer: Option B. -> Lower frequencies are easier to amplify
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. In the above question, what is the power in sidebands?
  1.    8 kW
  2.    6 kW
  3.    06 kW
  4.    9 kW
Explanation:-
Answer: Option C. -> 06 kW
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. In the above question, what is the power in sidebands ?
  1.    8 kW
  2.    6 kW
  3.    06 kW
  4.    9 kW
Explanation:-
Answer: Option C. -> 06 kW
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. In TV transmission, sound signal is ______________modulated?
  1.    Amplitude
  2.    Frequency
  3.    Phase
  4.    None of the above
Explanation:-
Answer: Option B. -> Frequency
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. In a TRF radio receiver, the RF and detection stages are tuned to______________?
  1.    Radio frequency
  2.    IF
  3.    Audio frequency
  4.    None of the above
Explanation:-
Answer: Option A. -> Radio frequency
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. The diode detector in an AM radio receiver is usually found _____________?
  1.    Before the first RF stage
  2.    After the first RF stage
  3.    After several stages of amplification
  4.    None of the above
Explanation:-
Answer: Option C. -> After several stages of amplification
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. Superhertodyne principle refers to_________________?
  1.    Using a large number of amplifier stages
  2.    Using a push-pull circuit
  3.    Obtaining lower fixed intermediate frequency
  4.    None of the above
Explanation:-
Answer: Option C. -> Obtaining lower fixed intermediate frequency
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. The superhetrodyne principle provides selectivity at ______________stage?
  1.    RF
  2.    IF
  3.    audio
  4.    Before RF
Explanation:-
Answer: Option B. -> IF
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. Modulation refers to a low-frequency signal controlling the ________________?
  1.    Amplitude of the carrier
  2.    Frequency of the carrier
  3.    Phase of the carrier
  4.    May be any of the above
Explanation:-
Answer: Option D. -> May be any of the above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. The major advantage of FM over AM is__________________?
  1.    Reception is less noisy
  2.    Higher carrier frequency
  3.    Smaller bandwidth
  4.    Small frequency deviation
Explanation:-
Answer: Option A. -> Reception is less noisy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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