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MCQs

Total Questions : 94 | Page 7 of 10 pages
Question 61.  
A zero-level detector is a
  1.    comparator with a sine-wave output
  2.    comparator with a trip point referenced to zero
  3.    peak detector
  4.    limiter
 Discuss Question
Answer: Option B. -> comparator with a trip point referenced to zero
Question 62.  A basic series regulator has
  1.    an error detector
  2.    a load
  3.    a reference voltage
  4.    both an error detector and a reference voltage
 Discuss Question
Answer: Option D. -> both an error detector and a reference voltage
Question 63.  A comparator is an example of a(n)
  1.    active filter
  2.    current source
  3.    linear circuit
  4.    nonlinear circuit
 Discuss Question
Answer: Option D. -> nonlinear circuit
Question 64.  Initially, the closed-loop gain (Acl) of a Wien-bridge oscillator should be
  1.    Acl < 3
  2.    Acl > 3
  3.    0
  4.    Acl approxequalto.gif 1
 Discuss Question
Answer: Option B. -> Acl > 3
Question 65. . Above the critical frequency (fc) of a low-pass filter, the output voltage gain _______.
  1.    does not change
  2.    doubles for every 1 kHz increase in frequency
  3.    increases
  4.    decreases
 Discuss Question
Answer: Option D. -> decreases
Question 66.  In an averaging amplifier, the input resistances are
  1.    equal to the feedback resistance
  2.    less than the feedback resistance
  3.    greater than the feedback resistance
  4.    unequal
 Discuss Question
Answer: Option C. -> greater than the feedback resistance
Question 67. . A two-pole high-pass active filter would have a roll-off rate of
  1.    40 dB/decade
  2.    –40 dB/decade
  3.    20 dB/decade
  4.    –20 dB/decade
 Discuss Question
Answer: Option B. -> –40 dB/decade
Question 68. . The ramp voltage at the output of an op-amp integrator
  1.    increases or decreases at a linear rate
  2.    increases or decreases exponentially
  3.    is always increasing and never decreasing
  4.    is constant
 Discuss Question
Answer: Option A. -> increases or decreases at a linear rate
Question 69. . A mathematical operation for finding the area under the curve of a graph is called __________.
  1.    differentiation
  2.    integration
  3.    curve averaging
  4.    linear regression
 Discuss Question
Answer: Option B. -> integration
Question 70. . A triangular-wave oscillator can consist of an op-amp comparator, followed by a(n)
  1.    differentiator
  2.    amplifier
  3.    integrator
  4.    multivibrator
 Discuss Question
Answer: Option C. -> integrator

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