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MCQs

Total Questions : 44 | Page 3 of 5 pages
Question 21. In an RC differentiator, the capacitor.
  1.    Charges exponentially at a rate depending on the RC time constant
  2.    Charges exponentially at a rate depending on the input voltage
  3.    Charges when the input voltage is decreasing
  4.    Charges to approximately one time constant
 Discuss Question
Answer: Option A. -> Charges exponentially at a rate depending on the RC time constant
Question 22. What is the highest frequency contained in a pulse that has a rise and fall time equal to 10 microseconds (10 μs)?
  1.    35 kHz
  2.    3.5 kHz
  3.    10 kHz
  4.    100 kHz
 Discuss Question
Answer: Option A. -> 35 kHz
Question 23. Referring to the give circuit, the output will.
  1.    Decay to zero at the end of the pulse
  2.    Reach 6 V at the end of the pulse
  3.    Reach 3.78 V at the end of the pulse
  4.    Reach 5.16 V at the end of the pulse
 Discuss Question
Answer: Option A. -> Decay to zero at the end of the pulse
Question 24. In an RL differentiator, when the input pulse goes from its low level to its high level,
  1.    The inductor prevents a sudden change in voltage
  2.    The inductor prevents a sudden change in current
  3.    Voltage across the inductor instantly reaches 63% of input voltage
  4.    Voltage across the inductor is zero
 Discuss Question
Answer: Option B. -> The inductor prevents a sudden change in current
Question 25. Referring to Problem 5, how long will it take the capacitor to discharge if the internal resistance of the pulse source is 100 Ω?
  1.    300 μs
  2.    600 μs
  3.    900 μs
  4.    1.5 ms
 Discuss Question
Answer: Option D. -> 1.5 ms
Question 26. In an RC differentiator, the sum of the capacitor voltage and the resistor voltage at any instant.
  1.    Must be zero
  2.    Must be equal to the applied voltage
  3.    Is less than the applied voltage but greater than zero
  4.    Cannot be determined
 Discuss Question
Answer: Option B. -> Must be equal to the applied voltage
Question 27. Referring this figure, on the falling edge.
  1.    The resistor voltage drops to -5 V and then goes back to zero exponentially
  2.    The resistor voltage jumps to -5 V and then goes back to zero exponentially
  3.    The capacitor voltage remains constant
  4.    The resistor voltage jumps to +5 V and then decreases exponentially to zero
 Discuss Question
Answer: Option B. -> The resistor voltage jumps to -5 V and then goes back to zero exponentially
Question 28. If the capacitor in an integrator opens, the output has the same voltage as the input.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 29. A dc component is the peak value of a pulse waveform.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 30. If the RC time constant of an integrator is increased, as the time constant is increased.
  1.    The capacitor charges more during a pulse and discharges less between pulses
  2.    The capacitor charges less during a pulse and discharges more between pulses
  3.    The capacitor charges more during a pulse and discharges more between pulses
  4.    The capacitor charges less during a pulse and discharges less between pulses
 Discuss Question
Answer: Option D. -> The capacitor charges less during a pulse and discharges less between pulses

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