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MCQs

Total Questions : 94 | Page 6 of 10 pages
Question 51. The input stage of an OP-amp is usually a ___________
  1.    differential amplifier
  2.    class B push-pull amplifier
  3.    CE amplifier
  4.    swamped amplifier
 Discuss Question
Answer: Option A. -> differential amplifier
Question 52. The output voltage Vo of the above circuit is
  1.    -6V
  2.    -5V
  3.    -1.2V
  4.    -0.2V
 Discuss Question
Answer: Option B. -> -5V
Question 53. A certain OP-amp has bias currents of 50 µA. The input offset current is
  1.    700 nA
  2.    99.3 µA
  3.    49.7 µA
  4.    none of these
 Discuss Question
Answer: Option A. -> 700 nA
Question 54. Which of the following amplifier is used in a digital to analog converter?
  1.    Non inverter
  2.    Voltage follower
  3.    Summer
  4.    Difference amplifier
 Discuss Question
Answer: Option C. -> Summer
Question 55. For an OP-amp having differential gain Av and common mode gain Ac the CMRR is given by
  1.    Av + Ac
  2.    Av / Ac
  3.    1 + (Av / Ac)
  4.    Ac / Av
 Discuss Question
Answer: Option B. -> Av / Ac
Question 56. The input offset current equals the ___________
  1.    difference between two base currents
  2.    average of two base currents
  3.    collector current divided by current gain
  4.    none of these
 Discuss Question
Answer: Option A. -> difference between two base currents
Question 57.  If the value of resistor Rf in an averaging amplifier circuit is equal to the value of one input resistor divided by the number of inputs, the output will be equal to
  1.    the average of the individual inputs
  2.    the inverted sum of the individual inputs
  3.    the sum of the individual inputs
  4.    the inverted average of the individual inputs
 Discuss Question
Answer: Option D. -> the inverted average of the individual inputs
Question 58.  A digital-to-analog converter is an application of the
  1.    scaling adder
  2.    voltage-to-current converter
  3.    noninverting amplifier
  4.    noninverting amplifier
 Discuss Question
Answer: Option A. -> scaling adder
Question 59.  
If the input to a comparator is a sine wave, the output is a
  1.    ramp voltage
  2.    sine wave
  3.    rectangular wave
  4.    sawtooth wave
 Discuss Question
Answer: Option C. -> rectangular wave
Question 60.  The center frequency of a band-pass filter is always equal to the
  1.    bandwidth
  2.    –3 dB frequency
  3.    bandwidth divided by Q
  4.    geometric average of the critical frequencies
 Discuss Question
Answer: Option D. -> geometric average of the critical frequencies

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