Deck 15: Transformers

Question 1

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

Answer 1

False

Question 2

The output of an RC differentiatorW ith an open capacitorW ill look like the input.

Answer 2

False

Question 3

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

Answer 3

True

Question 4

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

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

Question 5

The output of an RC integrator is the capacitorʹs voltage drop.

Question 6

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

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

Question 7

An RL integrator is a basic RL low-pass filterW ith a pulse applied to it.

Question 8

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

Question 9

An RC integrating circuit is a basic high-pass filterW ith a pulse applied to it.

Question 10

When the input pulseW idth to an RC integrator is much less than 5τ, the output approaches the shape of the input.

Question 11

What is one time constant in an integrating circuit if a 10 $\mathrm { k } \Omega$ resistor is in series with a 470 $\mu \mathrm { F }$ capacitor?

A) 0.47 ms
B) 4.7 s
C) 0.47 $\mu S$
D) 0.047 $\mu S$

Question 12

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

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

Question 13

An open inductor in an RL differentiatorW ill cause the output to resemble the input.

Question 14

The output of a differentiator circuitW ill reach the same maximum and minimum levels as the input as long as the time constant of the circuit is less than theW idth of the input pulse.

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

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

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

Question 20

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

Question 21

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

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

Question 22

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) the RC has the widest output pulse
D) you can't tell the difference by observing the output wave forms

Question 23

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

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

Question 24

What is the output voltage at the end of the input pulse to an RL integrator if the resistance is $1 \mathrm { k } \Omega$ the inductor is $1 \mathrm { H }$ and the input is a $22 \mathrm {~V} , 2$ ms pulse?

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

Question 25

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

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

Question 26

The output from an R_C differentiator resembles the input if_______-

A) $\mathrm { T }$ is less than the pulse width
B) $\mathrm { T }$ is equal to the pulse width
C) $T$ is much less than the pulse width
D) $\mathrm { T }$ is much larger that the pulse width

Question 27

The output from an RC integrator resembles the input if _________

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

Question 28

RC and RL integrators provide the same outputW hen the inputs are ________.

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

Question 29

What is output voltage at the end of the input pulse to an RL integrator if the resistance is 22 https://d2lvgg3v3hfg70.cloudfront.net/TB34225555/. the inductor is 2 H and the input is a 12 V, 0.0909 ms pulse?

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

Question 30

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

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

Question 31

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

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

Question 32

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

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

Question 33

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

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

Question 34

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

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

Question 35

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

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

Question 36

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

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

Question 37

The output from an RL differentiator is taken across the ________.

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

Question 38

If the input pulse to an RC differentiator is very short compared to the circuitʹs time constant, the differentiatorʹs output is ________.

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

Question 39

What is V_C at the end of the input pulse to an R_C integrator if the resistance is 5 $\mathrm { k } \Omega$ , the capacitance is 0.47 $\mu \mathrm { F }$ and the input is a 15 V, 4.7 ms pulse?

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

Question 40

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

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

Question 41

Pulse width ( t_W ) is defined as:

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

Question 42

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

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

Question 43

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

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

Question 44

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

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

Question 45

What is the output voltage at the end of the input pulse from an RL integrator that uses a 400 mH inductor, a 5 $\mathrm { k } \Omega$ resistor and a 5V, 1.2 ms input pulse?

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

Question 46

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

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

Question 47

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

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

Question 48

To completely charge a 500 $\mu \mathrm { F }$ capacitor in 15 seconds, use a ________ resistor.

A) 12 $\mathrm { k } \Omega$
B) 24 $k \Omega$
C) 18 $\mathrm { k } \Omega$
D) 6 $\mathrm { k } \Omega$

Question 49

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) is very large compared to t_W.
B) is equal to th.
C) is very small compared to t_W .
D) is five times t_W .

Question 50

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

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

Question 51

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

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

Question 52

If the input pulse to an RC differentiator is very short compared to the circuitʹs time constant, then the differentiatorʹs output is ________.

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

Question 53

The output of an RL integrator is taken across the ________.

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

Question 54

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

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

Question 55

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

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

Question 56

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

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

Question 57

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

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

Question 58

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

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

Question 59

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

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

Question 60

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

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

Question 61

A timing circuit makes use of Which of the following?

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

Question 62

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 63

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

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

Question 65

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

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