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MCQs

Total Questions : 18 | Page 2 of 2 pages
Question 11. Negative feedback is employed in ___________
  1.    Oscillators
  2.    Rectifiers
  3.    Amplifiers
  4.    None of the above
 Discuss Question
Answer: Option C. -> Amplifiers
Question 12. When current feedback (negative) is applied to an amplifier, its input impedance ___________
  1.    Is decreased
  2.    Is increased
  3.    Remains the same
  4.    None of the above
 Discuss Question
Answer: Option A. -> Is decreased
Question 13. When voltage feedback (negative) is applied to an amplifier, its input impedance ___________
  1.    Is decreased
  2.    Is increased
  3.    Remains the same
  4.    None of the above
 Discuss Question
Answer: Option B. -> Is increased
Question 14. If voltage feedback (negative) is applied to an amplifier, its output impedance ___________
  1.    Remains the same
  2.    Is increased
  3.    Is decreased
  4.    None of the above
 Discuss Question
Answer: Option C. -> Is decreased
Question 15. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative feedback is approximately___________
  1.    500
  2.    100
  3.    1000
  4.    5000
 Discuss Question
Answer: Option B. -> 100
Question 16. The value of negative feedback fraction is always ___________
  1.    Less than 1
  2.    More than 1
  3.    Equal to 1
  4.    None of the above
 Discuss Question
Answer: Option A. -> Less than 1
Question 17. When current feedback (negative) is applied to an amplifier, its output impedance
  1.    Is increased
  2.    Is decreased
  3.    Remains the same
  4.    None of the above
 Discuss Question
Answer: Option A. -> Is increased
Question 18. Emitter follower is used for ___________
  1.    Current gain
  2.    Impedance matching
  3.    Voltage gain
  4.    None of the above
 Discuss Question
Answer: Option B. -> Impedance matching

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