Time Response of Reactive Circuits Objective Questions - ObjectiveBooks

# Practice Test: Question Set - 03

1. When a 12 V input pulse with a width equal to one time constant is applied to an RC integrator, the capacitor charges to
(A) 0 V
(B) 12 V
(C) 6.3 V
(D) 7.56 V

2. Referring to Problem 5, how long will it take the capacitor to discharge if the internal resistance of the pulse source is 100 Ω?
(A) 300 μs
(B) 600 μs
(C) 900 μs
(D) 1.5 ms

3. A dc component is the peak value of a pulse waveform.
(A) True
(B) False

4. Referring to the give circuit, the output will

(A) Decay to zero at the end of the pulse
(B) Reach 6 V at the end of the pulse
(C) Reach 3.78 V at the end of the pulse
(D) Reach 5.16 V at the end of the pulse

5. In an RL differentiating circuit, the output voltage is taken across the resistor.
(A) True
(B) False

6. In an RL differentiator, when the input pulse goes from its low level to its high level,
(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

7. Referring this figure, on the falling edge,

(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

8. If the capacitor in an integrator becomes leaky,
(A) The time constant will be effectively reduced
(B) The wave-shape of the output voltage across C is altered
(C) The amplitude of the output is reduced
(D) All of the above

9. If the capacitor in an integrator opens, the output has the same voltage as the input.
(A) True
(B) False

10. If the RC time constant of an integrator is increased, as the time constant is increased
(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

11. The rising and falling edges of a pulse waveform contain the higher frequency component.
(A) True
(B) False

12. Referring to Problem 7, how much will the capacitor charge if the pulse width is increased to 12 ms?
(A) 2.51 V
(B) 25.14 V
(C) 4.86 V
(D) 12.76 V

13. When a 24 V input pulse with a width equal to five time constants is applied to an RC integrator, the capacitor charges to
(A) 24 V
(B) 15.12 V
(C) 20.64 V
(D) 12 V

14. In an integrator, when the pulse width of the input is much less than the transient time, the output voltage approaches the shape of the input.
(A) True
(B) False

15. When a 15 V input pulse with a width equal to two time constants is applied to an RC integrator, the capacitor charges to
(A) 15 V
(B) 12.9 V
(C) 8.6 V
(D) 19.45 V

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