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MCQs

Analog Electronics

Total Questions : 482 | Page 2 of 49 pages
Question 11. In a p⁺n junction diode under reverse bias , the magnitude of electric field is maximum at
  1.     The edge of the depletion region on the p-side
  2.     The edge of the depletion region on the n-side
  3.     The p⁺n junction
  4.     The center of the depletion region on the n-side
 Discuss Question
Answer: Option C. ->  The p⁺n junction
Question 12. In a cb amplifier the maximum efficiency could be
  1.     99%
  2.     85%
  3.     50%
  4.     25%
 Discuss Question
Answer: Option D. ->  25%
Question 13. Negative feedback in an amplifier
  1.     Reduces gain
  2.     Increase frequency &phase distortion
  3.     Reduces bandwidth
  4.     Increases noise
 Discuss Question
Answer: Option A. ->  Reduces gain
Question 14. The cascade amplifier is a multistage configuration of
  1.     CC-CB
  2.     CE-CB
  3.     CB-CC
  4.     CE-CC
 Discuss Question
Answer: Option B. ->  CE-CB
Question 15. If=0.98, ico=6µa and iβ=100µa for a transistor,then the value of ic will be
  1.     2.3mA
  2.     3.2mA
  3.     4.6mA
  4.     5.2mA
 Discuss Question
Answer: Option D. ->  5.2mA
Explanation :
Question 16. Which of the following is not associated with a p-n junction
  1.     Junction capacitance
  2.     Charge storage capacitance
  3.     Depletion capacitance
  4.     Channel length modulation
 Discuss Question
Answer: Option D. ->  Channel length modulation
Question 17. In a common emitter, unbypassed resister provides
  1.     voltage shunt feedback
  2.     current series feedback
  3.     negative voltage feedback
  4.     positive current feedback
 Discuss Question
Answer: Option C. ->  negative voltage feedback
Question 18. The most commonly used amplifier in sample & hold circuits is
  1.     A unity gain non-inverting amplifier
  2.     A unity gain inverting amplifier
  3.     An inverting amplifier with a gain of 10
  4.     An inverting amplifiers with a gain of 100
 Discuss Question
Answer: Option B. ->  A unity gain inverting amplifier
Question 19. An amplifier without feedback has a voltage gain of 50,input resistance os 1 kΩ & output resistance of 2.5kΩ.the input resistance of the current shunt negative feedback amplifier using the above amplifier with a feedbacik factor of 0.2 is
  1.     1/11KΩ
  2.     1/5KΩ
  3.     5KΩ
  4.     11KΩ
 Discuss Question
Answer: Option A. ->  1/11KΩ
Question 20. An amplifier using an opamp with slew rate sr=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 khz without introducing any slew-rate induced distortion, then the input signal level must not exceed
  1.     795mV
  2.     395mV
  3.     79.5 mV
  4.     39.5mV
 Discuss Question
Answer: Option C. ->  79.5 mV

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