Question 1

The top or flat portion of a pulse represents:

Accepted Answer

A)  the peak value 
B)  the higher frequency components 
C)  the average value 
D)  the lower frequency components 
A)  the peak value 
B)  the higher frequency components 
C)  the average value 
D)  the lower frequency components

Question 2

The rise time of an ideal pulse is zero.

Accepted Answer

A) True 
 B)False

Question 3

The flat portion of a pulse waveform contains the average value.

Accepted Answer

A) True 
 B)False

Question 4

If R = 2.2 kΩ, C = 1 µF, the pulse width = 5 ms, and the peak voltage of the pulse = 50 V, to what voltage will the capacitor charge in an RC integrator?

Accepted Answer

A)  22.43 V 
B)  44.85 V 
C)  18.57 V 
D)  37.41 V 
A)  22.43 V 
B)  44.85 V 
C)  18.57 V 
D)  37.41 V

Question 5

What does the average value of the differentiator output voltage equal during steady state?

Accepted Answer

A)  peak value 
B)  0 V 
C)  0.637 × Peak 
D)  0.707 × Peak 
A)  peak value 
B)  0 V 
C)  0.637 × Peak 
D)  0.707 × Peak

Question 6

Figure 20-3
-See Figure 20-3. What is the peak current that flows through the capacitor?

Accepted Answer

A)  0 mA 
B)  10 mA 
C)  1 mA 
D)  5 mA 
A)  0 mA 
B)  10 mA 
C)  1 mA 
D)  5 mA

Question 7

When the pulse width is less than five time constants, the capacitor voltage in an RC integrator:

Accepted Answer

A)  only partially charges 
B)  follows the input voltage 
C)  charges to maximum 
D)  discharges to minimum 
A)  only partially charges 
B)  follows the input voltage 
C)  charges to maximum 
D)  discharges to minimum

Question 8

In an R-C integrating circuit, the output voltage is taken across the capacitor.

Accepted Answer

A) True 
 B)False

Question 9

The rate of charging and discharging of a capacitor is controlled by:

Accepted Answer

A)  the period of the input 
B)  the peak input voltage 
C)  the RC time constant 
D)  the frequency of the input 
A)  the period of the input 
B)  the peak input voltage 
C)  the RC time constant 
D)  the frequency of the input

Question 10

The transient time of an R-C or R-L circuit equals five time constants.

Accepted Answer

A) True 
 B)False

Question 11

The RC differentiator is:

Accepted Answer

A)  a basic high-pass filter 
B)  a basic band-pass filter 
C)  a basic low-pass filter 
D)  a basic band-stop filter 
A)  a basic high-pass filter 
B)  a basic band-pass filter 
C)  a basic low-pass filter 
D)  a basic band-stop filter

Question 12

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 peak current IC that flows after the switch is closed?

Accepted Answer

A)  0.7 mA 
B)  infinity 
C)  0.3 mA 
D)  1.0 mA 
A)  0.7 mA 
B)  infinity 
C)  0.3 mA 
D)  1.0 mA

Question 13

The time for a capacitor to fully charge or discharge is called the transient ramp.

Accepted Answer

A) True 
 B)False

Question 14

For a capacitor to completely charge in an RC integrator, the pulse width must be _ five time constants.

Accepted Answer

A)  less than 
B)  much less than 
C)  greater than or equal to 
D)  much greater than 
A)  less than 
B)  much less than 
C)  greater than or equal to 
D)  much greater than

Question 15

Figure 20-1
-A certain pulse waveform has a rise-time 6 nS and a fall-time of 9 nS. What is the highest frequency component in the waveform?

Accepted Answer

A)  117 MHz 
B)  58.3 MHz 
C)  23.3 MHz 
D)  38.9 MHz 
A)  117 MHz 
B)  58.3 MHz 
C)  23.3 MHz 
D)  38.9 MHz

Question 16

A series of pulses is called:

Accepted Answer

A)  periodic 
B)  rise time 
C)  pulse width 
D)  duty cycle 
A)  periodic 
B)  rise time 
C)  pulse width 
D)  duty cycle

Question 17

If the capacitor in an RC integrator shorts, the output:

Accepted Answer

A)  would measure zero volts 
B)  is at ground 
C)  would measure the same as the input 
D)  none of the above 
A)  would measure zero volts 
B)  is at ground 
C)  would measure the same as the input 
D)  none of the above

Question 18

Integration is:

Accepted Answer

A)  an averaging process 
B)  a process for establishing a rate of change 
C)  used for mixing different input signals 
D)  a summing operation 
A)  an averaging process 
B)  a process for establishing a rate of change 
C)  used for mixing different input signals 
D)  a summing operation

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

Figure 20-3
-See Figure 20-3. What is VC at t = 1 ms? Assume that the capacitor is initially discharged.

Accepted Answer

A)  VC = 8.33 V 
B)  VC = 0 V 
C)  VC = 5 V 
D)  VC = 10 V 
A)  VC = 8.33 V 
B)  VC = 0 V 
C)  VC = 5 V 
D)  VC = 10 V

Exam 20: Time Response of Reactive Circuits

The top or flat portion of a pulse represents:

The rise time of an ideal pulse is zero.

The flat portion of a pulse waveform contains the average value.

If R = 2.2 kΩ, C = 1 µF, the pulse width = 5 ms, and the peak voltage of the pulse = 50 V, to what voltage will the capacitor charge in an RC integrator?

What does the average value of the differentiator output voltage equal during steady state?

Figure 20-3 -See Figure 20-3. What is the peak current that flows through the capacitor?

When the pulse width is less than five time constants, the capacitor voltage in an RC integrator:

In an R-C integrating circuit, the output voltage is taken across the capacitor.

The rate of charging and discharging of a capacitor is controlled by:

The transient time of an R-C or R-L circuit equals five time constants.

The RC differentiator is:

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 peak current IC that flows after the switch is closed?

The time for a capacitor to fully charge or discharge is called the transient ramp.

For a capacitor to completely charge in an RC integrator, the pulse width must be _ five time constants.

Figure 20-1 -A certain pulse waveform has a rise-time 6 nS and a fall-time of 9 nS. What is the highest frequency component in the waveform?

A series of pulses is called:

If the capacitor in an RC integrator shorts, the output:

Integration is:

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

Figure 20-3 -See Figure 20-3. What is VC at t = 1 ms? Assume that the capacitor is initially discharged.

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