Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)
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?
1)
A)
The capacitor has decreased in value.
B)
The resistor has opened.
C)
The capacitor has increased in value.
D)
The resistor has decreased in value.
2)
What is output voltage at the end of the input pulse to an RL integrator if the resistance is 22 k,
the inductor is 2 H and the input is a 12 V, 0.0909 ms pulse?
2)
A)
11.8 V
B)
10.4 V
C)
7.59 V
D)
11.4 V
3)
What is one time constant in an integrating circuit if a 10 k resistor is in series with a 470 µF
capacitor?
3)
A)
4.7 s
B)
0.047 µs
C)
0.47 µs
D)
0.47 ms
4)
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.
4)
A)
26.0 V
B)
28.5 V
C)
29.4 V
D)
19.0 V
5)
How long will it take to completely charge a 0.22 µF capacitor through a 5.2 M resistor?
5)
A)
2.29 s
B)
5.72 s
C)
1.14 s
D)
4.58 s
6)
A timing circuit makes use of which of the following?
6)
A)
RL differentiator
B)
RC integrator
C)
RC Differentiator
D)
either A or C
7)
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?
7)
A)
0 V
B)
7.59 V
C)
12 V
D)
4.41 V
B
8)
What is VC at the end of the input pulse to an RC integrator if the resistance is 5 k, the
capacitance is 0.47 µF and the input is a 15 V, 4.7 ms pulse?
8)
A)
14.3 V
B)
14.7 V
C)
9.48 V
D)
13.0 V
D
9)
RC and RL integrators provide the same output when the inputs are ________.
9)
A)
different
B)
the outputs are never the same
C)
the same
C
10)
If the input pulse to an RC differentiator is very short compared to the circuit’s time constant, then
the differentiator’s output is ________.
10)
A)
a square wave very similar to the input voltage
B)
a dc voltage equal to the peak input voltage
C)
a dc value of about half the peak input voltage
D)
zero volts
A
B
11)
RC and RL integrators produce an output voltage that equals the:
11)
A)
mathematical product.
B)
mathematical difference.
C)
mathematical average.
D)
mathematical sum.
12)
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?
12)
A)
14.25 V
B)
13.0 V
C)
9.48 V
D)
14.7 V
13)
Pulse width (tW) is defined as:
13)
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.
14)
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.
14)
A)
6.3 V
B)
10 V
C)
3.7 VC
D)
5 V
15)
What is the time constant in an RC integrating circuit if a 22 k resistor is in series with a 0.02 µF
capacitor?
15)
A)
0.044 µs
B)
0.044 ms
C)
0.44 ms
D)
0.44 s
16)
What is the output voltage at the end of the input pulse to an RL integrator if the resistance is 1 k,
the inductor is 1 H and the input is a 22 V, 2 ms pulse?
16)
A)
21.6 V
B)
13.9 V
C)
20.9 V
D)
19.0 V
17)
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?
17)
A)
The resistor has decreased in value.
B)
The resistor has opened.
C)
The capacitor has decreased in value.
D)
The capacitor has increased in value.
18)
If an RC integrator uses a 47µF capacitor, a 12 k resistor and a square wave input with a
frequency of 200 kHz, its approximate output is ________.
18)
A)
a near dc voltage of about half the peak square wave voltage
B)
a square wave with a frequency of 200 kHz
C)
0 V
D)
a square wave with a frequency of 100 kHz
19)
How long will it take a 0.047 µF capacitor to completely discharge through a 10 k resistor?
19)
A)
2.35 ms
B)
5 s
C)
0.47 ms
D)
0.18 ms
20)
What is VC at the end of the input pulse to an RC integrator if the resistance is 5 k, the
capacitance is 47 µF and the input is a 15 V, 470 ms pulse?
20)
A)
9.48 V
B)
13 V
C)
14.7 V
D)
14.3 V
21)
If a square wave input produces 0 V output from an RC integrator, ________.
21)
A)
the capacitor is leaky
B)
the capacitor is open
C)
the resistor is shorted
D)
the resistor is open
22)
What is the output voltage at the end of the input pulse from an RL integrator that uses a 400 mH
inductor, a 5 k resistor and a 5 V, 1.2 ms input pulse?
22)
A)
4.75 V
B)
3.16 V
C)
4.532 V
D)
5 V
D
23)
To completely charge a 500 µF capacitor in 15 seconds, use a ________ resistor.
23)
A)
6 k
B)
24 k
C)
18 k
D)
12 k
A
24)
The output of an RL integrator is taken across the ________.
24)
A)
resistor and inductor
B)
resistor
C)
source
D)
inductor
B
25)
RC integrators can be used in timing circuits to set a specified time delay if the output is coupled to:
25)
A)
a voltage generating circuit.
B)
a voltage threshold sensitive circuit.
C)
a current sensitive circuit.
D)
a power threshold sensitive circuit.
B
D
26)
What is one time constant in an integrating circuit if a 47 k resistor is in series with a 0.01 µF
capacitor?
26)
A)
0.47 s
B)
0.47 ms
C)
0.047 ms
D)
0.047 µs
27)
In RC and RL integrators and differentiators, transient time is equal to the:
27)
A)
time constant.
B)
pulse width.
C)
time constant times five.
D)
pulse width times five.
28)
How does the RC differentiator output look when 5 is much less than the pulse width?
28)
A)
square waves
B)
negative spikes
C)
positive spikes
D)
positive and negative spikes
29)
The output from an RC integrator resembles the input if ________.
29)
A)
is much larger that the pulse width
B)
is much less than the pulse width
C)
is less than the pulse width
D)
is equal to the pulse width
30)
What is VC at the end of the input pulse to an RC integrator if the resistance is 22 k, the
capacitance is 0.05 µF and the input is a 12 V, 2.2 ms pulse?
30)
A)
10.4 V
B)
7.58 V
C)
4.42 V
D)
12 V
31)
How long will it take a 22 µF capacitor to completely charge through a 1.2 M resistor?
31)
A)
132 s
B)
13.2 s
C)
0.264 s
D)
2.64 s
32)
What is the output voltage at the end of the input pulse from an RL integrator that uses a 200 mH
inductor, a 22 k resistor and a 12 V, 9.09 µs input pulse?
32)
A)
10.38 V
B)
11.4 V
C)
11.76 V
D)
7.59 V
33)
Polarity of the output of an RL differentiator is determined by:
33)
A)
the polarity of the incoming pulse.
B)
an external clipping circuit.
C)
the time constant of the RL circuit.
D)
the placement of the inductor.
34)
How long will it take to completely discharge a 0.47 µF capacitor through a 10 k resistor?
34)
A)
2.35 s
B)
23.5 ms
C)
0.18 ms
D)
0.47 ms
35)
What is output voltage at the end of the input pulse to an RC integrator if the resistance is 10 k,
the capacitance is 100 µF and the input is a 50 V, 10 s pulse?
35)
A)
50 V
B)
31.6 V
C)
47.5 V
D)
43.25 V
36)
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 µF and the input is a 50 V, 1 s pulse?
36)
A)
47.5 V
B)
50 V
C)
43.25 V
D)
31.6 V
37)
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.
37)
A)
5 V
B)
10 V
C)
6.3 V
D)
3.7 V
38)
What is one time constant in an integrating circuit if a 4.7 k resistor is in series with a 0.005 µF
capacitor?
38)
A)
2.35 ms
B)
235 ms
C)
0.00235 ms
D)
0.0235 ms
39)
A pulse–waveform to DC convertor makes use of an integrator:
39)
A)
with a time constant shorter than the width of the input pulse.
B)
with an extremely large time constant.
C)
with a time constant much wider than the width of the input pulse.
D)
either B or C
40)
What is the output voltage from an RL integrator that uses a 10 mH inductor, a 10 resistor and a
16 V, 1 ms input pulse?
40)
A)
16.3 V
B)
15.2 V
C)
10.1 V
D)
13.8 V
41)
If the input pulse to an RC differentiator is very short compared to the circuit’s time constant, the
differentiator’s output is ________.
41)
A)
a dc voltage equal to the peak input voltage
B)
a square wave very similar to the input voltage
C)
a dc value of about half the peak input voltage
D)
zero volts
42)
What is the time constant in an RC integrating circuit if a 10 k resistor is in series with a 220 µF
capacitor?
42)
A)
2.2 s
B)
0.22 ms
C)
22 ms
D)
2.2 ms
43)
What is the output voltage at the end of the input pulse to an RL integrator if the resistance is 1.2 k
, the inductor is 200 mH and the input is a 5 V, 1.2 ms pulse?
43)
A)
4.532 V
B)
4.75 V
C)
3.16 V
D)
5 V
44)
RC and RL differentiators produce an output voltage that closely approximates the:
44)
A)
mathematical rate of change process.
B)
mathematical difference.
C)
mathematical average.
D)
mathematical sum.
45)
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:
45)
A)
is equal to tW.
B)
is five times tW.
C)
is very large compared to tW.
D)
is very small compared to tW.
46)
What is the output voltage at the end of the input pulse from an RL integrator that uses a 2 H
inductor, a 10 k resistor and a 32 V, 0.4 ms input pulse?
46)
A)
21.6 V
B)
19.0 V
C)
13.9 V
D)
27.7 V
47)
To charge a 100 µF capacitor in 15 seconds, use a ________ resistor.
47)
A)
15 k
B)
35 k
C)
30 k
D)
25 k
48)
If RC and RL differentiators with equal time constants receive the same pulse, ________.
48)
A)
the RC has the widest output pulse
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)
one outputs an increasing exponential while the other outputs a decreasing exponential
49)
The output from an RL differentiator is taken across the ________.
49)
A)
resistor and inductor
B)
resistor
C)
inductor
D)
source
50)
The output from an RC differentiator resembles the input if ________.
50)
A)
is less than the pulse width
B)
is much less than the pulse width
C)
is equal to the pulse width
D)
is much larger that the pulse width
51)
How does the RC differentiator output look when 5 is much longer than the pulse width?
51)
A)
positive and negative spikes
B)
positive spikes
C)
negative spikes
D)
square waves
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
52)
LC and RC integrators, with respect to input and output, perform exactly the same.
52)
53)
In an RL integrating circuit, the output is taken across the inductor.
53)
54)
Since voltage is constant during the peak of a pulse input, the output of an LC integrator is constant
during this time as well.
54)
55)
In an RC integrating circuit, the output is taken across the capacitor.
55)
56)
The output of an RC differentiator with an open capacitor will look like the input.
56)
57)
The output of an RC differentiating circuit is taken across the resistor.
57)
58)
An RC integrating circuit is a basic high–pass filter with a pulse applied to it.
58)
59)
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.
59)
60)
When the input pulse width to an RC integrator is much less than 5, the output approaches the
shape of the input.
60)
61)
In an RC integrator, as the time constant gets longer, the maximum capacitor voltage gets smaller.
61)
62)
An RL integrator is a basic RL low–pass filter with a pulse applied to it.
62)
63)
The output from an RL integrator can look exactly the same as the output from an RC integrator.
63)
64)
The output of an RC integrator is the capacitor’s voltage drop.
64)
65)
It takes a capacitor 5 time constants to nearly reach full charge.
65)
66)
An open inductor in an RL differentiator will cause the output to resemble the input.
66)
Answer Key
Testname: C15
Answer Key
Testname: C15
14