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MCQs

Total Questions : 163 | Page 9 of 17 pages
Question 81.  What three subcircuits does a phase locked loop (PLL) consist of?
  1.    phase comparator, comparator, and VCO
  2.    phase comparator, bandpass filter, and VCO
  3.    phase comparator, bandpass filter, and demodulator
  4.    phase comparator, low-pass filter, and VCO
 Discuss Question
Answer: Option D. -> phase comparator, low-pass filter, and VCO
Question 82.  The common-mode voltage gain is
  1.    smaller than differential voltage gain
  2.    equal to voltage gain
  3.    greater than differential voltage gain
  4.    None of the above
 Discuss Question
Answer: Option A. -> smaller than differential voltage gain
Question 83.  An output that is proportional to the addition of two or more inputs is from which type of amplifier?
  1.    differentiator
  2.    difference
  3.    summing
  4.    analog subtractor
 Discuss Question
Answer: Option C. -> summing
Question 84.  The Schmitt trigger is a two-state device that is used for:
  1.    pulse shaping
  2.    peak detection
  3.    input noise rejection
  4.    filtering
 Discuss Question
Answer: Option A. -> pulse shaping
Question 85.  How many logic states does an S-R flip-flop have?
  1.    2
  2.    3
  3.    4
  4.    5
 Discuss Question
Answer: Option C. -> 4
Question 86. . When a capacitor is used in place of a resistor in an op-amp network, its placement determines:
  1.    open- or closed-loop gain
  2.    integration or differentiation
  3.    saturation or cutoff
  4.    addition or subtraction
 Discuss Question
Answer: Option B. -> integration or differentiation
Question 87. . A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms?
  1.    1.4 mV rms
  2.    650 mV rms
  3.    4.55 V rms
  4.    0.455 V rms
 Discuss Question
Answer: Option C. -> 4.55 V rms
Question 88. . What is the difference between common-mode and differential-mode input signals?
  1.    phase relationship
  2.    voltage
  3.    current
  4.    apparent power
 Discuss Question
Answer: Option A. -> phase relationship
Question 89. . The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals:
  1.    the ratio of the input resistance to the feedback resistance
  2.    the open-loop voltage gain Aol
  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 90. . An ideal amplifier should have:
  1.    high input current
  2.    zero offset
  3.    high output impedance
  4.    moderate gain
 Discuss Question
Answer: Option B. -> zero offset

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