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MCQs

Total Questions : 94 | Page 1 of 10 pages
Question 1. The common mode gain is ___________
  1.    very high
  2.    very low
  3.    always unity
  4.    unpredictable
 Discuss Question
Answer: Option B. -> very low
Question 2. Current cannot flow to ground through .
  1.    a mechanical ground
  2.    an a.c. ground
  3.    a virtual ground
  4.    an ordinary ground
 Discuss Question
Answer: Option C. -> a virtual ground
Question 3. An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed
  1.    795mV
  2.    395mV
  3.    795mV
  4.    39.5mV
 Discuss Question
Answer: Option C. -> 795mV
Question 4. An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is[Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.]
  1.    10 volts
  2.    5 volts
  3.    5/1 volts
  4.    5/2 volts
 Discuss Question
Answer: Option D. -> 5/2 volts
Question 5. When a step-input is given to an OP-amp integrator, the output will be
  1.    A ramp
  2.    A sinusoidal wave
  3.    A rectangular wave
  4.    A triangular wave with dc bias
 Discuss Question
Answer: Option A. -> A ramp
Question 6. Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05μF
  1.    1.273 kHz
  2.    12.73 kHz
  3.    127.3 kHz
  4.    127.3 Hz
 Discuss Question
Answer: Option A. -> 1.273 kHz
Question 7. The output of a particular OP-amp increases 8V in 12µs. The slew rate is
  1.    90 V/µs
  2.    0.67 V/µs
  3.    1.5 V/µs
  4.    none of these
 Discuss Question
Answer: Option B. -> 0.67 V/µs
Question 8. The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k
  1.    ∞
  2.    120k
  3.    110k
  4.    10k
 Discuss Question
Answer: Option C. -> 110k
Question 9. The common mode voltage gain of a differential amplifier is equal to RC divided by
  1.    re
  2.    2re
  3.    re/2
  4.    2RE
 Discuss Question
Answer: Option D. -> 2RE
Question 10. For an OP-amp with negative feedback, the output is .
  1.    equal to the input
  2.    increased
  3.    fed back to the inverting input
  4.    fed back to the noninverting input
 Discuss Question
Answer: Option C. -> fed back to the inverting input

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