Question 1

Figure 20-1
-What is the steady state output of the differentiator circuit in Figure 20-1?

Accepted Answer

A)  20 V 
B)  6.37 V 
C)  12.74 V 
D)  0 V 
A)  20 V 
B)  6.37 V 
C)  12.74 V 
D)  0 V D

Question 2

The average value of a waveform is its:

Accepted Answer

A)  ac component 
B)  dc component 
C)  tw 
D)  rising edge minus falling edge 
A)  ac component 
B)  dc component 
C)  tw 
D)  rising edge minus falling edge B

Question 3

The output of an RC integrator approaches the shape of the input pulse when:

Accepted Answer

A)  the pulse width is increased 
B)  the pulse width is decreased 
C)  the pulse is at minimum 
D)  the pulse is at maximum 
A)  the pulse width is increased 
B)  the pulse width is decreased 
C)  the pulse is at minimum 
D)  the pulse is at maximum A

Question 4

What is the highest frequency contained in a pulse that has rise and fall times of 17 ns?

Accepted Answer

A)  20.6 MHz 
B)  10.3 MHz 
C)  168 MHz 
D)  206 MHz 
A)  20.6 MHz 
B)  10.3 MHz 
C)  168 MHz 
D)  206 MHz

Question 5

The RC differentiator is characterized by:

Accepted Answer

A)  introduces tilt to the flat portion of a pulse 
B)  eliminates the dc component of the input 
C)  produces a zero average-value output voltage 
D)  reduction of lower frequency components 
E)  all of the above 
A)  introduces tilt to the flat portion of a pulse 
B)  eliminates the dc component of the input 
C)  produces a zero average-value output voltage 
D)  reduction of lower frequency components 
E)  all of the above

Question 6

An RL integrator can act as a _ filter and an RC differentiator can act as a filter.

Accepted Answer

A)  high-pass, low-pass 
B)  low-pass, high-pass 
C)  high-pass, high-pass 
D)  low-pass, low-pass 
A)  high-pass, low-pass 
B)  low-pass, high-pass 
C)  high-pass, high-pass 
D)  low-pass, low-pass

Question 7

The shape of a repetitive-pulse affects the determination of the pulse repetition frequency.

Accepted Answer

A) True 
 B)False

Question 8

A mathematical operation that determines the rate of change of a curve is called .

Accepted Answer

A)  mixing 
B)  integrator 
C)  curve averaging 
D)  differentiation 
A)  mixing 
B)  integrator 
C)  curve averaging 
D)  differentiation

Question 9

With repetitive pulses, the amount of capacitor charge or discharge in an RC integrator depends upon:

Accepted Answer

A)  the circuit time constant 
B)  the input peak voltage 
C)  the input frequency 
D)  both the circuit time constant and the input frequency 
A)  the circuit time constant 
B)  the input peak voltage 
C)  the input frequency 
D)  both the circuit time constant and the input frequency

Question 10

If the resistor voltage in a differentiating circuit is down to + 2.4 V at the end of a 14 V input pulse, to what negative value will the resistor voltage go in response to the falling edge of the input?

Accepted Answer

A)  -11.6 V 
B)  -16.4 V 
C)  -14 V 
D)  -2.4 V 
A)  -11.6 V 
B)  -16.4 V 
C)  -14 V 
D)  -2.4 V

Question 11

Figure 20-2
-See Figure 20-2. Assume that the capacitor is initially charged to 3 V before the switch is closed. What is the current that flows after an elapsed time of 20 ms?

Accepted Answer

A)  0.67 mA 
B)  0.20 mA 
C)  0.23 mA 
D)  0.47 mA 
A)  0.67 mA 
B)  0.20 mA 
C)  0.23 mA 
D)  0.47 mA

Question 12

In a repetitive-pulse RC integrator circuit, what would the steady-state voltage equal at the end of the fifth pulse? Assume a VIN of 20 V.

Accepted Answer

A)  0 V 
B)  14.62 V 
C)  1.46 V 
D)  20 V 
A)  0 V 
B)  14.62 V 
C)  1.46 V 
D)  20 V

Question 13

The voltage across a capacitor in an RC integrator circuit cannot change exponentially, it can change only instantaneously.

Accepted Answer

A) True 
 B)False

Question 14

In an R-L differentiating circuit, the output voltage is taken across the resistor.

Accepted Answer

A) True 
 B)False

Question 15

A mathematical operation for finding the area under the curve of a graph is called .

Accepted Answer

A)  integration 
B)  mixing 
C)  curve averaging 
D)  differentiation 
A)  integration 
B)  mixing 
C)  curve averaging 
D)  differentiation

Question 16

What is the capacitor voltage in an RC integrator when the pulse width is equal to or greater than five time constants?

Accepted Answer

A)  fully charged 
B)  37% of maximum 
C)  63% of maximum 
D)  86% of maximum 
A)  fully charged 
B)  37% of maximum 
C)  63% of maximum 
D)  86% of maximum

Question 17

Figure 20-3
-See Figure 20-3. If the square wave pulse width is decreased to 1.0 µs, how will the VC waveform change?

Accepted Answer

A)  The average value will drop to zero 
B)  The peak voltage reached will increase. 
C)  The corners will be less rounded 
D)  The waveform will become flattened. 
A)  The average value will drop to zero 
B)  The peak voltage reached will increase. 
C)  The corners will be less rounded 
D)  The waveform will become flattened.

Question 18

If a periodic pulse waveform is applied to an RC integrator, the output waveshape depends on the relationship of the circuit time constant and the duty cycle of the input pulses.

Accepted Answer

A) True 
 B)False

Question 19

When there is a sudden change in voltage, a capacitor, for an instant, appears as:

Accepted Answer

A)  a resistive circuit 
B)  a short circuit 
C)  a fully charged capacitor 
D)  an open circuit 
A)  a resistive circuit 
B)  a short circuit 
C)  a fully charged capacitor 
D)  an open circuit

Question 20

The fast rising and falling edges of a pulse waveform represent:

Accepted Answer

A)  the rise times 
B)  the lower frequency components 
C)  the fall times 
D)  the higher frequency components 
A)  the rise times 
B)  the lower frequency components 
C)  the fall times 
D)  the higher frequency components

Exam 20: Time Response of Reactive Circuits

Figure 20-1 -What is the steady state output of the differentiator circuit in Figure 20-1?

The average value of a waveform is its:

The output of an RC integrator approaches the shape of the input pulse when:

What is the highest frequency contained in a pulse that has rise and fall times of 17 ns?

The RC differentiator is characterized by:

An RL integrator can act as a _ filter and an RC differentiator can act as a filter.

The shape of a repetitive-pulse affects the determination of the pulse repetition frequency.

A mathematical operation that determines the rate of change of a curve is called .

With repetitive pulses, the amount of capacitor charge or discharge in an RC integrator depends upon:

If the resistor voltage in a differentiating circuit is down to + 2.4 V at the end of a 14 V input pulse, to what negative value will the resistor voltage go in response to the falling edge of the input?

Figure 20-2 -See Figure 20-2. Assume that the capacitor is initially charged to 3 V before the switch is closed. What is the current that flows after an elapsed time of 20 ms?

In a repetitive-pulse RC integrator circuit, what would the steady-state voltage equal at the end of the fifth pulse? Assume a VIN of 20 V.

The voltage across a capacitor in an RC integrator circuit cannot change exponentially, it can change only instantaneously.

In an R-L differentiating circuit, the output voltage is taken across the resistor.

A mathematical operation for finding the area under the curve of a graph is called .

What is the capacitor voltage in an RC integrator when the pulse width is equal to or greater than five time constants?

Figure 20-3 -See Figure 20-3. If the square wave pulse width is decreased to 1.0 µs, how will the VC waveform change?

If a periodic pulse waveform is applied to an RC integrator, the output waveshape depends on the relationship of the circuit time constant and the duty cycle of the input pulses.

When there is a sudden change in voltage, a capacitor, for an instant, appears as:

The fast rising and falling edges of a pulse waveform represent:

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