EEE - Time Response of Reactive Circuits Quiz (or) MCQ

1 .

In electronic systems, repetitive-pulse waveforms are encountered.

A)

About as often as single pulses

B)

Less often than single pulses

C)

Twice as often as single pulses

D)

More often than single pulses

Correct Answer : More often than single pulses

2 .

To understand how the output voltage is shaped by a differentiator, you must consider

A)

The response to the rising pulse edge

B)

The response to the falling pulse edge

C)

The response between the rising and falling edges

D)

All of the above

Correct Answer : All of the above

3 .

In an RC differentiator, the capacitor.

A)

Charges to approximately one time constant

B)

Charges when the input voltage is decreasing

C)

Charges exponentially at a rate depending on the RC time constant

D)

Charges exponentially at a rate depending on the input voltage

Correct Answer : Charges exponentially at a rate depending on the RC time constant

4 .

What is the highest frequency contained in a pulse that has a rise and fall time equal to 10 microseconds (10 Î¼s)?

A)

3.5 kHz

B)

10 kHz

C)

35 kHz

D)

100 kHz

Correct Answer : 35 kHz

5 .

Referring to the give circuit, the output will.

A)

Reach 6 V at the end of the pulse

B)

Decay to zero 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

Correct Answer : Decay to zero at the end of the pulse

6 .

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

A)

Voltage across the inductor is zero

B)

The inductor prevents a sudden change in current

C)

The inductor prevents a sudden change in voltage

D)

Voltage across the inductor instantly reaches 63% of input voltage

Correct Answer : The inductor prevents a sudden change in current

7 .

Referring to Problem 7, how much will the capacitor charge if the pulse width is increased to 12 ms?

A)

2.51 V

B)

4.86 V

C)

12.76 V

D)

25.14 V

Correct Answer : 25.14 V

8 .

The output of an RC integrator is taken across the

A)

Resistor

B)

Diode

C)

Source

D)

Capacitor

Correct Answer : Capacitor

9 .

Referring this circuit, determine the maximum output voltage when a single pulse is applied as shown. The total resistance is 60 Ω.

A)

2.67 V

B)

2.73 V

C)

27.33 V

D)

30 V

Correct Answer : 27.33 V

10 .

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

Correct Answer : 7.56 V

11 .

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)

20.64 V

C)

15.12 V

D)

12 V

Correct Answer : 24 V

12 .

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)

8.6 V

B)

12.9 V

C)

15 V

D)

19.45 V

Correct Answer : 12.9 V

13 .

Referring to the bellow figure, determine the voltage level that the output will reach during the pulse.

A)

0 V

B)

6.3 V

C)

9.45 V

D)

15 V

Correct Answer : 9.45 V

14 .

If the capacitor in an integrator becomes leaky.

A)

The amplitude of the output is reduced

B)

The time constant will be effectively reduced

C)

The wave-shape of the output voltage across C is altered

D)

All of the above

Correct Answer : All of the above

15 .

A steady-state condition is reached when

A)

The output voltage reaches the input voltage

B)

The output voltage reaches approximately 63% of the input voltage

C)

The output voltage reaches the average value 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

16 .

The flat portions of a pulse waveform contain low-frequency components.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

17 .

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

Correct Answer : 1.5 ms

18 .

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

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

Correct Answer : Must be equal to the applied voltage

19 .

Referring this figure, on the falling edge.

A)

The capacitor voltage remains constant

B)

The resistor voltage drops to -5 V and then goes back to zero exponentially

C)

The resistor voltage jumps to -5 V and then goes back to zero exponentially

D)

The resistor voltage jumps to +5 V and then decreases exponentially to zero

Correct Answer : The resistor voltage jumps to -5 V and then goes back to zero exponentially

20 .

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

C)

Can Not Say

D)

None of the above

Correct Answer : True

21 .

In an electric circuit, the reaction of a circuit to a given pulse input is known as the pulse response.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

22 .

In an RC differentiator, responding to repetitive pulses, the average value of the output.

A)

Is zero

B)

Is equal to the input voltage

C)

Is 63 percent of the input voltage

D)

Cannot be determined

Correct Answer : Is zero

23 .

If a periodic pulse waveform has a pulse width and the time between pulses each equal to or greater than five time constants, the capacitor will

A)

Fully charge and partially discharge during each period of the input waveform

B)

Partially charge and fully discharge during each period of the input waveform

C)

Fully charge and fully discharge during each period of the input waveform

D)

Partially charge and partially discharge during each period of the input waveform

Correct Answer : Fully charge and fully discharge during each period of the input waveform

24 .

In an RL integrating circuit, the output voltage is taken across the inductor.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : False

25 .

In an RC integrating circuit, the output voltage is taken across the capacitor.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

26 .

With an RL integrator, at the instant of the rising pulse edge,

A)

63 percent of the input voltage is across the resistor

B)

63 percent of the input voltage is across the inductor

C)

All the input voltage is across the resistor

D)

All the input voltage is across the inductor

Correct Answer : All the input voltage is across the inductor

27 .

An RC differentiator acts as a

A)

Low-pass filter

B)

High-pass filter

C)

Band-pass filter

D)

Band-stop filter

Correct Answer : High-pass filter

28 .

The rising and falling edges of a pulse waveform contain the higher frequency component.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

29 .

A single 6 V pulse with a width of 600 μs is applied to an integrator consisting of a 150 kΩ resistor and a 0.002 μF capacitor. To what voltage will the capacitor charge?

A)

0 V

B)

3.78 V

C)

5.16 V

D)

6 V

Correct Answer : 5.16 V

30 .

A dc component is the peak value of a pulse waveform.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : False

31 .

If the capacitor in an integrator opens, the output has the same voltage as the input.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

32 .

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 less during a pulse and discharges less between pulses

D)

The capacitor charges more during a pulse and discharges more between pulses

Correct Answer : The capacitor charges less during a pulse and discharges less between pulses

33 .

In an RC differentiating circuit, the output voltage is taken across the resistor.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : True

34 .

In an RL differentiating circuit, the output voltage is taken across the resistor.

A)

True

B)

False

C)

Can Not Say

D)

None of the above

Correct Answer : False

35 .

An integrator consists of a 3.3 kΩ resistor and a 2 μF capacitor. A single 30 V, 6 ms pulse is applied to the input. How much will the capacitor charge?

A)

10.3 V

B)

12.09 V

C)

17.91 V

D)

30 V

Correct Answer : 17.91 V