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Home Electrical Engineering Time Response of Reactive Circuits Comments

  • Question
  • A steady-state condition is reached when


  • Options
  • A. the output voltage reaches the average value of the input voltage
  • B. the output voltage reaches the input voltage
  • C. the output voltage reaches approximately 63% of the input voltage
  • D. the output voltage reaches the effective value of the input voltage

  • Correct Answer
  • the output voltage reaches the average value of the input voltage 


  • Time Response of Reactive Circuits problems


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    • 1. In an RC differentiator, the sum of the capacitor voltage and the resistor voltage at any instant

    • Options
    • A. must be zero
    • B. must be equal to the applied voltage
    • C. is less than the applied voltage but greater than zero
    • D. cannot be determined
    • Discuss
    • 2. In an RC differentiator, the capacitor

    • Options
    • A. charges exponentially at a rate depending on the RC time constant
    • B. charges exponentially at a rate depending on the input voltage
    • C. charges when the input voltage is decreasing
    • D. charges to approximately one time constant
    • Discuss
    • 3. If the RC time constant of an integrator is increased, as the time constant is increased

    • Options
    • A. the capacitor charges more during a pulse and discharges less between pulses
    • B. the capacitor charges less during a pulse and discharges more between pulses
    • C. the capacitor charges more during a pulse and discharges more between pulses
    • D. the capacitor charges less during a pulse and discharges less between pulses
    • Discuss
    • 4. Referring this circuit, determine the maximum output voltage when a single pulse is applied as shown. The total resistance is 60 Ω.


    • Options
    • A. 2.73 V
    • B. 27.33 V
    • C. 30 V
    • D. 2.67 V
    • Discuss
    • 5. If the capacitor in an integrator becomes leaky,

    • Options
    • A. the time constant will be effectively reduced
    • B. the waveshape of the output voltage across C is altered
    • C. the amplitude of the output is reduced
    • D. all of the above
    • Discuss
    • 6. In an RL differentiator, when the input pulse goes from its low level to its high level,

    • Options
    • A. the inductor prevents a sudden change in voltage
    • B. the inductor prevents a sudden change in current
    • C. voltage across the inductor instantly reaches 63% of input voltage
    • D. voltage across the inductor is zero
    • Discuss
    • 7. When a 24 V input pulse with a width equal to five time constants is applied to an RC integrator, the capacitor charges to

    • Options
    • A. 24 V
    • B. 15.12 V
    • C. 20.64 V
    • D. 12 V
    • Discuss
    • 8. To understand how the output voltage is shaped by a differentiator, you must consider

    • Options
    • A. the response to the rising pulse edge
    • B. the response between the rising and falling edges
    • C. the response to the falling pulse edge
    • D. all of the above
    • Discuss
    • 9. Referring this figure, on the falling edge,


    • Options
    • A. the resistor voltage drops to ?5 V and then goes back to zero exponentially
    • B. the resistor voltage jumps to ?5 V and then goes back to zero exponentially
    • C. the capacitor voltage remains constant
    • D. the resistor voltage jumps to +5 V and then decreases exponentially to zero
    • Discuss
    • 10. Referring to Problem 5, how long will it take the capacitor to discharge if the internal resistance of the pulse source is 100 Ω?

    • Options
    • A. 300 µs
    • B. 600 µs
    • C. 900 µs
    • D. 1.5 ms
    • Discuss


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