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MCQs

Total Questions : 94 | Page 3 of 10 pages
Question 21. An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is
  1.    10 V
  2.    5 V
  3.    5 V
  4.    5/2 V
 Discuss Question
Answer: Option A. -> 10 V
Question 22. The closed-loop voltage gain of an inverting amplifier equal to
  1.    The ratio of the input resistance to feedback resistance
  2.    The open-loop voltage gain
  3.    The feedback resistance divided by the input resistance
  4.    The input resistance
 Discuss Question
Answer: Option C. -> The feedback resistance divided by the input resistance
Question 23. If ground is applied to the (+) terminal of an inverting OP-amp, the (–) terminal will
  1.    Not need an input resistor
  2.    Be virtual ground
  3.    Have high reverse current
  4.    Not invert the signal
 Discuss Question
Answer: Option B. -> Be virtual ground
Question 24. Of the values listed, the most realistic value for open-loop voltage gain of an OP-amp is
  1.    1
  2.    2000
  3.    80 dB
  4.    100000
 Discuss Question
Answer: Option D. -> 100000
Question 25. A certain inverting amplifier has a closed-loop voltage gain of 25. The OP-amp has an open-loop voltage gain of 100,000. If an OP-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain
  1.    doubles
  2.    drops to 12.5
  3.    remains at 25
  4.    increases slightly
 Discuss Question
Answer: Option C. -> remains at 25
Question 26. How many OP-amps are required to implement this equation Vo = V1
  1.    4
  2.    3
  3.    2
  4.    1
 Discuss Question
Answer: Option D. -> 1
Question 27. The input impedance of a differential amplifier equals r'e times
  1.    ß
  2.    RE
  3.    RC
  4.    2ß
 Discuss Question
Answer: Option D. -> 2ß
Question 28. A 741-Type OP-amp has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of
  1.    50KHz
  2.    100KHz
  3.    1000/17KHz
  4.    1000/7.07KHz
 Discuss Question
Answer: Option A. -> 50KHz
Question 29. In the above circuit the current ix is
  1.    0.6A
  2.    0.5A
  3.    0.2A
  4.    1/12A
 Discuss Question
Answer: Option B. -> 0.5A
Question 30. The ideal OP-amp has the following characteristics.
  1.    Ri=∞ A=∞ R0=0
  2.    Ri=0 A=∞ R0=0
  3.    Ri=∞ A=∞ R0=∞
  4.    Ri=0 A=∞ R0=∞
 Discuss Question
Answer: Option A. -> Ri=∞ A=∞ R0=0

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