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MCQs

Total Questions : 163 | Page 8 of 17 pages
Question 71. When a transistor is cut off___________
  1.    Maximum voltage appears across transistor
  2.    Maximum current flows
  3.    Maximum voltage appears across load
  4.    None of the above
 Discuss Question
Answer: Option A. -> Maximum voltage appears across transistor
Question 72. Low efficiency of a power amplifier results in ___________
  1.    Low forward bias
  2.    Less battery consumption
  3.    More battery consumption
  4.    None of the above
 Discuss Question
Answer: Option C. -> More battery consumption
Question 73. If the gain versus frequency curve of a transistor amplifier is not flat, then there is distortion.
  1.    Amplitude
  2.    Intermodulation
  3.    Frequency
  4.    None of the above
 Discuss Question
Answer: Option C. -> Frequency
Question 74. A power amplifier has comparatively ___________ ß
  1.    Small
  2.    Large
  3.    Very large
  4.    None of the above
 Discuss Question
Answer: Option A. -> Small
Question 75. The driver stage usually employs___________
  1.    Class A power amplifier
  2.    Push-pull amplifier
  3.    Class C amplifier
  4.    None of the above
 Discuss Question
Answer: Option A. -> Class A power amplifier
Question 76. Power amplifiers generally use transformer coupling because transformer per-mits
  1.    Cooling of the circuit
  2.    Impedance matching
  3.    Distortionless output
  4.    Good frequency response
 Discuss Question
Answer: Option B. -> Impedance matching
Question 77.  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 78.  If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value?
  1.    7.82 V
  2.    saturation
  3.    cutoff
  4.    9.52 V
 Discuss Question
Answer: Option D. -> 9.52 V
Question 79.  The major difference between ground and virtual ground is that virtual ground is only a:
  1.    voltage reference
  2.    current reference
  3.    power reference
  4.    difference reference
 Discuss Question
Answer: Option A. -> voltage reference
Question 80.  If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?
  1.    Common-mode
  2.    Single-ended
  3.    Double-ended
  4.    Noninverting mode
 Discuss Question
Answer: Option B. -> Single-ended

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