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MCQs

Total Questions : 94 | Page 5 of 10 pages
Question 41. A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high
  1.    CMMR
  2.    Bandwidth
  3.    Slew rate
  4.    Open-loop gain
 Discuss Question
Answer: Option C. -> Slew rate
Question 42. With zero volts on both inputs, an OP-amp ideally should have an output ___________
  1.    equal to the positive supply voltage
  2.    equal to the negative supply voltage
  3.    equal to zero
  4.    equal to CMRR
 Discuss Question
Answer: Option C. -> equal to zero
Question 43. A differential amplifier has a differential gain of 20,000. CMRR=80dB. The common mode gain is given by
  1.    2
  2.    1
  3.    1/2
  4.    0
 Discuss Question
Answer: Option A. -> 2
Question 44. The tail current of a differential amplifier is .
  1.    half of either collector current
  2.    equal to either collector current
  3.    two times either collector current
  4.    equal to the difference in base currents
 Discuss Question
Answer: Option C. -> two times either collector current
Question 45. The use of negative feedback
  1.    reduces the voltage gain of an Op-amp
  2.    makes the Op-amp oscillate
  3.    makes linear operation possible
  4.    A and B both
 Discuss Question
Answer: Option D. -> A and B both
Question 46. In the common mode, ___________
  1.    both inputs are grounded
  2.    the outputs are connected together
  3.    an identical signal appears on both the inputs
  4.    the output signal are in-phase
 Discuss Question
Answer: Option C. -> an identical signal appears on both the inputs
Question 47. The two input terminals of an opamp are labeled as
  1.    High and low
  2.    Positive and negative
  3.    Inverting and non inverting
  4.    Differential ans non differential
 Discuss Question
Answer: Option C. -> Inverting and non inverting
Question 48. OP-amp circuits may be cascaded without changing their input output relationships
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 49. A common mode signal is applied to ___________
  1.    the noninverting input
  2.    the inverting input
  3.    both iputs
  4.    top of the tail resistor
 Discuss Question
Answer: Option C. -> both iputs
Question 50. Differential amplifiers are used in
  1.    Instrumentation amplifiers
  2.    Voltage followers
  3.    Voltage regulators
  4.    Buffers
 Discuss Question
Answer: Option A. -> Instrumentation amplifiers

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