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MCQs

Total Questions : 94 | Page 9 of 10 pages
Question 81.  Circuits that shift the dc level of a signal are called
  1.    limiters
  2.    clampers
  3.    peak detectors
  4.    dc converters
 Discuss Question
Answer: Option B. -> clampers
Question 82.  An instrumentation amplifier has a high
  1.    output impedance
  2.    power gain
  3.    CMRR
  4.    supply voltage
 Discuss Question
Answer: Option C. -> CMRR
Question 83.  The basic instrumentation amplifier has ________ input(s).
  1.    1
  2.    2
  3.    capacitive
  4.    resistive
 Discuss Question
Answer: Option B. -> 2
Question 84.  A Schmitt trigger is a comparator with _______.
  1.    modulation
  2.    a closed-loop gain less than one
  3.    hysteresis
  4.    a high threshold value
 Discuss Question
Answer: Option C. -> hysteresis
Question 85. . An instrumentation amplifier has extremely high ________, good ________, and high ________.
  1.    input impedance, common-mode rejection, gain
  2.    noise factor, grounding, power
  3.    working voltages, current capacity, output impedance
  4.    output gain, output loading, power
 Discuss Question
Answer: Option A. -> input impedance, common-mode rejection, gain
Question 86. . A(n) ________ amplifier is used if the application requires a high sensitivity to low-level signals and protection from high-voltage associated circuits.
  1.    basic instrumentation
  2.    operational transconductance
  3.    log/antilog amplifier
  4.    isolation
 Discuss Question
Answer: Option D. -> isolation
Question 87. . The gain of an OTA is the ratio of the output current to the input voltage, and is measured in _____________.
  1.    amps
  2.    volts
  3.    siemens
  4.    no units
 Discuss Question
Answer: Option C. -> siemens
Question 88.  The precision rectifier circuit is designed to _________.
  1.    rectify waveforms with very large voltage swings
  2.    rectify waveforms with very small voltage swings
  3.    rectify precision waveforms
  4.    amplify and rectify waveforms
 Discuss Question
Answer: Option B. -> rectify waveforms with very small voltage swings
Question 89. . The external resistor of a typical instrumentation amplifier is used to set the ________.
  1.    impedance
  2.    rejection ratio
  3.    gain
  4.    isolation
 Discuss Question
Answer: Option C. -> gain
Question 90. . If an operational transconductance amplifier (OTA) is used as an amplitude modulator, the voltage gain is varied by applying a _________ voltage to the ______ input.
  1.    demodulation, bias
  2.    modulation, bias
  3.    bias, modulation
  4.    low-frequency, bias
 Discuss Question
Answer: Option B. -> modulation, bias

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