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MCQs

Total Questions : 122 | Page 4 of 13 pages
Question 31. For faithful amplification by a transistor circuit, the value of VBE should ___________ for a silicon transistor
  1.    Be zero
  2.    Be 0.01 V
  3.    Not fall below 0.7 V
  4.    Be between 0 V and 0.1 V
 Discuss Question
Answer: Option C. -> Not fall below 0.7 V
Question 32. An ideal value of stability factor is ___________
  1.    100
  2.    200
  3.    More than 200
  4.    1
 Discuss Question
Answer: Option D. -> 1
Question 33. At series or parallel resonance, the circuit power factor is ___________
  1.    0%
  2.    5%
  3.    10%
  4.    8%
 Discuss Question
Answer: Option C. -> 10%
Question 34. The relation between ß and a is ___________
  1.    ß = 1 / (1 – a )
  2.    ß = (1 – a ) / a
  3.    ß = a / (1 – a )
  4.    ß = a / (1 + a )
 Discuss Question
Answer: Option C. -> ß = a / (1 – a )
Question 35. If Q of an LC circuit increases, then bandwidth ___________
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Insufficient data
 Discuss Question
Answer: Option B. -> Decreases
Question 36. In a transistor ___________
  1.    IC = IE + IB
  2.    IB = IC + IE
  3.    IE = IC - IB
  4.    IE = IC + IB
 Discuss Question
Answer: Option D. -> IE = IC + IB
Question 37. The leakage current in CE arrangement is ___________ that in CB arrangement
  1.    more than
  2.    less than
  3.    the same as
  4.    none of the above
 Discuss Question
Answer: Option A. -> more than
Question 38. The arrow in the symbol of a transistor indicates the direction of ___________
  1.    electron current in the emitter
  2.    electron current in the collector
  3.    hole current in the emitter
  4.    donor ion current
 Discuss Question
Answer: Option C. -> hole current in the emitter
Question 39. In the double tuned circuit, if the mutual inductance between the two tuned circuits is decreased, the level of resonance curve ___________
  1.    Remains the same
  2.    Is lowered
  3.    Is raised
  4.    None of the above
 Discuss Question
Answer: Option C. -> Is raised
Question 40. In the above question, what are the values of cut-off frequencies?
  1.    140 kHz , 60 kHz
  2.    1020 kHz , 980 kHz
  3.    1030 kHz , 970 kHz
  4.    None of the above
 Discuss Question
Answer: Option B. -> 1020 kHz , 980 kHz

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