Deck 15: Time Response of Reactive Circuits

Question 1

The output of an RC integrator is the capacitor's voltage drop.

Answer 1

True

Question 2

A watchdog circuit is used to monitor for a particular condition in a circuit so that corrective action can be taken.

Answer 2

True

Question 3

Since voltage is constant during the peak of a pulse input, the output of an LC integrator is constant during this time as well.

Answer 3

False

Question 4

When the input pulse width to an RC integrator is much less than 5l, the output approaches the shape of the input.

Question 5

It takes a capacitor 5 time constants to nearly reach full charge.

Question 6

The output of an RC differentiator with an open capacitor will look like the input.

Question 7

How long will it take a 0.047 µF capacitor to completely discharge through a 10 kΩ resistor?

A)0.18 ms
B)0.47 ms
C)5 s
D)2.35 ms

Question 8

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

Question 9

An open inductor in an RL differentiator will cause the output to resemble the input.

Question 10

What is one time constant in an integrating circuit if a 47 kΩ resistor is in series with a 0.01 µF capacitor?

A)0.047 µs
B)0.047 ms
C)0.47 ms
D)0.47 s

Question 11

The output from an RL integrator can look exactly the same as the output from an RC integrator.

Question 12

An RL integrator is a basic RL low -pass filter with a pulse applied to it.

Question 13

What is one time constant in an integrating circuit if a 10 kΩ resistor is in series with a 470 µF capacitor?

A)0.047 µs
B)4.7 s
C)0.47 ms
D)0.47 µs

Question 14

How long will it take a 22 µF capacitor to completely charge through a 1.2 MΩ resistor?

A)2.64 s
B)0.264 s
C)13.2 s
D)132 s

Question 15

LC and RC integrators, with respect to input and output, perform exactly the same.

Question 16

The output of an RC differentiating circuit is taken across the resistor.

Question 17

In an RC integrator, as the time constant gets longer, the maximum capacitor voltage gets smaller.

Question 18

The output of a differentiator circuit will reach the same maximum and minimum levels as the input as long as the time constant of the circuit is less than the width of the input pulse.

Question 19

An RC integrating circuit is a basic high -pass filter with a pulse applied to it.

Question 20

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

Question 21

What is VC at the end of the input pulse to an RC integrator if the resistance is 22 kΩ, the capacitance is 0.05 µF and the input is a 12 V, 2.2 ms pulse?

A)7.58 V
B)4.42 V
C)12 V
D)10.4 V

Question 22

The output from an RC integrator resembles the input if .

A)l is equal to the pulse width
B)l is much larger that the pulse width
C)l is less than the pulse width
D)l is much less than the pulse width

Question 23

What is VC at the end of the input pulse to an RC integrator if the resistance is 5 kΩ, the capacitance is 0.47 µF and the input is a 15 V, 4.7 ms pulse?

A)14.7 V
B)14.3 V
C)9.48 V
D)13.0 V

Question 24

To charge a 100 µF capacitor in 15 seconds, use a resistor.

A)35 kΩ
B)15 kΩ
C)30 kΩ
D)25 kΩ

Question 25

What is VC at the end of the input pulse to an RC integrator if the input pulse is 12 V and the pulse width equals one time constant?

A)4.41 V
B)0 V
C)7.59 V
D)12 V

Question 26

If the input pulse to an RC differentiator is very short compared to the circuit's time constant, the differentiator's output is _.

A)zero volts
B)a dc value of about half the peak input voltage
C)a dc voltage equal to the peak input voltage
D)a square wave very similar to the input voltage

Question 27

The output from an RL differentiator is taken across the .

A)resistor and inductor
B)inductor
C)source
D)resistor

Question 28

What is the output voltage at the end of the input pulse to an RL integrator if the resistance is 1.2 k Ω, the inductor is 200 mH and the input is a 5 V, 1.2 ms pulse?

A)4.75 V
B)5 V
C)3.16 V
D)4.532 V

Question 29

What is one time constant in an integrating circuit if a 4.7 kΩ resistor is in series with a 0.005 µF capacitor?

A)0.00235 ms
B)2.35 ms
C)235 ms
D)0.0235 ms

Question 30

RC and RL integrators provide the same output when the inputs are .

A)the same
B)the outputs are never the same
C)different

Question 31

What is output voltage at the end of the input pulse to an RL integrator if the resistance is 22 kΩ, the inductor is 2 H and the input is a 12 V, 0.0909 ms pulse?

A)11.4 V
B)11.8 V
C)10.4 V
D)7.59 V

Question 32

What is VC at the end of the input pulse to an RC integrator if the input pulse is 15 V and the pulse width equals one time constant?

A)9.48 V
B)14.7 V
C)13.0 V
D)14.25 V

Question 33

If an RC integrator uses a 47µF capacitor, a 12 kΩ resistor and a square wave input with a frequency of 200 kHz, its approximate output is .

A)a square wave with a frequency of 200 kHz
B)a square wave with a frequency of 100 kHz
C)a near dc voltage of about half the peak square wave voltage
D)0 V

Question 34

What is output voltage at the end of the input pulse to an RC integrator if the resistance is 10 kΩ, the capacitance is 100 µF and the input is a 50 V, 10 s pulse?

A)43.25 V
B)47.5 V
C)50 V
D)31.6 V

Question 35

The output from an RC differentiator resembles the input if .

A)l is equal to the pulse width
B)l is much larger that the pulse width
C)l is much less than the pulse width
D)l is less than the pulse width

Question 36

What is the output voltage at the end of the input pulse to an RL integrator if the resistance is 1 kΩ, the inductor is 1 H and the input is a 22 V, 2 ms pulse?

A)21.6 V
B)19.0 V
C)13.9 V
D)20.9 V

Question 37

How does the RC differentiator output look when 5l is much less than the pulse width?

A)positive spikes
B)square waves
C)negative spikes
D)positive and negative spikes

Question 38

The capacitor of an RC integrator charges to equal to six time constants. if the input is a 10 V pulse with a pulse width

A)5 V
B)3.7 V
C)6.3 V
D)10 V

Question 39

The capacitor of an RC integrator charges to equal to one time constant. if the input is a 10 V pulse with a pulse width

A)3.7 VC
B)6.3 V
C)10 V
D)5 V

Question 40

What is the output voltage from an RL integrator that uses a 10 mH inductor, a 10 Ω resistor and a 16 V, 1 ms input pulse?

A)16.3 V
B)10.1 V
C)15.2 V
D)13.8 V

Question 41

If RC and RL differentiators with equal time constants receive the same pulse, .

A)one outputs an increasing exponential while the other outputs a decreasing exponential
B)the RL has the most narrow spikes on the output
C)you can't tell the difference by observing the output wave forms
D)the RC has the widest output pulse

Question 42

The capacitor of an RC integrator charges to equal to one time constant. if the input is a 30 V pulse with a pulse width

A)19.0 V
B)29.4 V
C)26.0 V
D)28.5 V

Question 43

RC integrators can be used to convert a repetitive pulse waveform to a constant dc voltage equal to the average voltage of the waveform if:

A)l is equal to tW.
B)l is five times tW.
C)l is very small compared to tW.
D)l is very large compared to tW.

Question 44

How does the RC differentiator output look when 5l is much longer than the pulse width?

A)negative spikes
B)positive and negative spikes
C)square waves
D)positive spikes

Question 45

If the input pulse to an RC differentiator is very short compared to the circuit's time constant, then the differentiator's output is .

A)a square wave very similar to the input voltage
B)a dc voltage equal to the peak input voltage
C)zero volts
D)a dc value of about half the peak input voltage

Question 46

To completely charge a 500 µF capacitor in 15 seconds, use a resistor.

A)18 kΩ
B)24 kΩ
C)6 kΩ
D)12 kΩ

Question 47

RC integrators can be used in timing circuits to set a specified time delay if the output is coupled to:

A)a power threshold sensitive circuit.
B)a voltage generating circuit.
C)a current sensitive circuit.
D)a voltage threshold sensitive circuit.

Question 48

What is the output voltage at the end of the input pulse from an RL integrator that uses a 400 mH inductor, a 5 kΩ resistor and a 5 V, 1.2 ms input pulse?

A)4.75 V
B)4.532 V
C)5 V
D)3.16 V

Question 49

Pulse width (tW)is defined as:

A)the time interval between changes in the pulse.
B)the time interval between identical points on the pulse.
C)the time interval between opposite points on the pulse.
D)all of these.

Question 50

What is the time constant in an RC integrating circuit if a 22 kΩ resistor is in series with a 0.02 µF capacitor?

A)0.044 µs
B)0.044 ms
C)0.44 ms
D)0.44 s

Question 51

What is the output voltage at the end of the input pulse from an RL integrator that uses a 2 H inductor, a 10 kΩ resistor and a 32 V, 0.4 ms input pulse?

A)13.9 V
B)27.7 V
C)21.6 V
D)19.0 V

Question 52

If a square wave input produces 0 V output from an RC integrator, .

A)the resistor is shorted
B)the capacitor is open
C)the resistor is open
D)the capacitor is leaky

Question 53

What is the output voltage at the end of the input pulse to an RC integrator if the resistance is 12 k Ω, the capacitance is 10 µF and the input is a 50 V, 1 s pulse?

A)43.25 V
B)50 V
C)31.6 V
D)47.5 V

Question 54

What is the time constant in an RC integrating circuit if a 10 kΩ resistor is in series with a 220 µF capacitor?

A)0.22 ms
B)2.2 s
C)2.2 ms
D)22 ms

Question 55

In RC and RL integrators and differentiators, transient time is equal to the:

A)pulse width.
B)time constant times five.
C)pulse width times five.
D)time constant.

Question 56

How long will it take to completely discharge a 0.47 µF capacitor through a 10 kΩ resistor?

A)0.47 ms
B)0.18 ms
C)2.35 s
D)23.5 ms

Question 57

What is VC at the end of the input pulse to an RC integrator if the resistance is 5 kΩ, the capacitance is 47 µF and the input is a 15 V, 470 ms pulse?

A)13 V
B)14.3 V
C)9.48 V
D)14.7 V

Question 58

How long will it take to completely charge a 0.22 µF capacitor through a 5.2 MΩ resistor?

A)1.14 s
B)4.58 s
C)2.29 s
D)5.72 s

Question 59

The output of an RL integrator is taken across the .

A)inductor
B)resistor
C)resistor and inductor
D)source

Question 60

What is the output voltage at the end of the input pulse from an RL integrator that uses a 200 mH inductor, a 22 kΩ resistor and a 12 V, 9.09 µs input pulse?

A)11.4 V
B)10.38 V
C)7.59 V
D)11.76 V

Question 61

A timing circuit makes use of which of the following?

A)RL differentiator
B)RC Differentiator
C)RC integrator
D)either A or C

Question 62

A given circuit using an RC integrator to turn on after 20 seconds now takes now takes much longer to turn on. What is the most probable cause?

A)The capacitor has decreased in value.
B)The resistor has decreased in value.
C)The capacitor has increased in value.
D)The resistor has opened.

Question 63

RC and RL differentiators produce an output voltage that closely approximates the:

A)mathematical sum.
B)mathematical average.
C)mathematical rate of change process.
D)mathematical difference.

Question 64

A given circuit using an RC integrator to turn on after 20 seconds now takes has been taking much longer to turn on. Now it entirely fails to turn on. What is the problem?

A)The resistor has opened.
B)The resistor has decreased in value.
C)The capacitor has increased in value.
D)The capacitor has decreased in value.

Question 65

If you want to monitor the frequency response of an RF circuit in real time, the circucit is driven by a swept -frequency generator and the output is monitored using a scope. The scope must _.

A)be in x -y mode.
B)have at least 10 times the bandswidth of the highest test frequency
C)change its time base to match the generator
D)all of the above

Question 66

RC and RL integrators produce an output voltage that equals the:

A)mathematical average.
B)mathematical sum.
C)mathematical product.
D)mathematical difference.

Question 67

Polarity of the output of an RL differentiator is determined by:

A)the time constant of the RL circuit.
B)the polarity of the incoming pulse.
C)the placement of the inductor.
D)an external clipping circuit.

Question 68

A pulse -waveform to DC convertor makes use of an integrator:

A)with a time constant shorter than the width of the input pulse.
B)with a time constant much wider than the width of the input pulse.
C)with an extremely large time constant.
D)either B or C