978-0132622264 c11 Part 1

subject Type Homework Help
subject Pages 9
subject Words 1388
subject Authors Louis Nashelsky, Robert L. Boylestad {

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page-pf1
Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)
If this circuit is to have a voltage gain of 1, the ratio of Rf : R1 should be ________.
1)
A)
2 : 1
B)
1: 2
C)
1 : 1
D)
Cannot be done in theory. It can be done in practice by making R1 much larger than Rf.
Answer:
D
A)
B)
C)
D)
2)
What is the design value for Rf?
2)
A)
282 k
B)
78.3
C)
180 k
D)
60
Answer:
A
A)
B)
C)
D)
1
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3)
Determine the gain of this circuit.
3)
A)
-0.1
B)
10
C)
-10
D)
0.1
Answer:
C
A)
B)
C)
D)
4)
By carefully configuring the op-amp external circuit components the op-amp can be made to
function as ________.
4)
A)
voltage-controlled current source
B)
current-controlled voltage source
C)
voltage-controlled voltage source
D)
All of the above
Answer:
D
A)
B)
C)
D)
5)
How many feedback resistors are found in a 3-input voltage summing circuit that is constructed
around an op-amp?
5)
A)
1
B)
3
C)
0
D)
2
Answer:
A
A)
B)
C)
D)
6)
An op-amp low-pass active filter provides a constant output ________.
6)
A)
from dc to infinite frequency
B)
from fol to foh
C)
for all frequencies higher than fol
D)
from dc to foh
Answer:
D
A)
B)
C)
D)
2
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7)
An op-amp high-pass active filter provides a constant output ________.
7)
A)
from dc to infinite frequency
B)
for all frequencies higher then fol
C)
from dc to foh
D)
from fol to foh
Answer:
B
A)
B)
C)
D)
8)
A constant-gain multiplier has three stages and a total gain of 22,200. For all thee feedback
resistors, Rf= 470 k. Two of the R1 resistor have a value of 33 k. What is the value of the third
R1?
8)
A)
4.6 k
B)
4.3 k
C)
3.4 k
D)
4.8 k
Answer:
B
A)
B)
C)
D)
9)
Which one of the following expressions model the function of a current-controlled current source?
9)
A)
Io= kVi
B)
Vo= kVi
C)
Vo= kIi
D)
Io= kIi
Answer:
D
A)
B)
C)
D)
10)
The voltage gain for this circuit is given as ________.
10)
A)
A =R1
Rf
B)
A = 1 +Rf
R1
C)
A = - R1
Rf
D)
A = - Rf
R1
Answer:
D
A)
B)
C)
D)
3
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11)
The potentiometer in an instrumentation amplifier is used to ________ .
11)
A)
adjust the scale factor
B)
balance the circuit
C)
prevent clipping
D)
all of the above
Answer:
A
A)
B)
C)
D)
12)
This op-amp is connected as a(n) ________.
12)
A)
inverting constant-gain multiplier
B)
voltage buffer
C)
noninverting constant-gain multiplier
D)
None of the above
Answer:
C
A)
B)
C)
D)
13)
Which one of the following expressions model the function of a current-controlled voltage source?
13)
A)
Vo= kVi
B)
Io= kVi
C)
Io= kIi
D)
Vo= kIi
Answer:
D
A)
B)
C)
D)
4
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14)
The voltage gain for this circuit is given as ________.
14)
A)
A = 1 +Rf
R1
B)
A = 1 +R1
Rf
C)
A = - Rf
R1
D)
A = - R1
Rf
Answer:
A
A)
B)
C)
D)
15)
The roll-off rate of a second order filter is ________.
15)
A)
20 dB / decade or 6 dB/octave
B)
60 dB/decade or 18 dB/octave
C)
0 dB/decade or 0 dB/octave
D)
40 dB/decade or 12 dB/octave
Answer:
D
A)
B)
C)
D)
16)
Which type of op-amp circuit has unity gain, no phase inversion, high input impedance, and low
output impedance?
16)
A)
differentiator
B)
substractor
C)
voltage buffer
D)
summing amplifier
Answer:
C
A)
B)
C)
D)
17)
Which one of the following expressions model the function of a voltage-controlled voltage source?
17)
A)
Vo= kIi
B)
Io= kIi
C)
Io= kVi
D)
Vo= kVi
Answer:
D
A)
B)
C)
D)
5
page-pf6
18)
The output of an op-amp voltage buffer is characterized by ________.
18)
A)
Vo=1 +Rf
R1Vi
B)
Vo= 1
C)
Vo= - Rf
R1Vi, where Rf=R1
D)
Vo=Vi
Answer:
D
A)
B)
C)
D)
19)
The output voltage, Vo, is given by ________.
19)
A)
Vo=R3
R1+ R3
R2+Rf
R2V1-Rf
R2V2
B)
Vo= - Rf
R2V2-R2
f
R1R3V1
C)
Vo= -V1Rf
R1+V2Rf
R2
R3
D)
None of the above
Answer:
A
A)
B)
C)
D)
6
page-pf7
20)
If this circuit is to have an inverting voltage gain of 1, the ratio of Rf : R1 should be ________.
20)
A)
1 : 1
B)
1: 2
C)
2 : 1
D)
Cannot be done in theory. It can be done in practice by making R1 much larger than Rf.
Answer:
A
A)
B)
C)
D)
21)
An active filter that provides a constant output from dc to foh, and then passes no signal abovefoh,
is called an ideal ________.
21)
A)
bandpass filter
B)
low-pass filter
C)
high-pass filter
D)
None of the above
Answer:
B
A)
B)
C)
D)
22)
This is a basic ________ circuit.
22)
A)
subtractor
B)
differentiator
C)
two-input multiplier
D)
integrator
Answer:
A
A)
B)
C)
D)
7
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23)
A second order low-pass filter has a high-end roll-off of ________.
23)
A)
60 dB/octave
B)
20 dB/octave
C)
40 dB/decade
D)
6 dB/decade
Answer:
C
A)
B)
C)
D)
24)
A gain of 7 is required from a noninverting constant-multiplier op-amp circuit. If the input resistor
is 5 k , what should be the value of the feedback resistor ?
24)
A)
5 k
B)
30 k
C)
7.5 k
D)
15 k
Answer:
B
A)
B)
C)
D)
25)
A constant-gain multiplier has three stages and a total gain of 22,200. For all three feedback
resistors, Rf= 470 k. Two of the R1 resistor have a value of 33 k. What is the individual gain of
the two identical stages where R1 is known?
25)
A)
-110.3
B)
110.3
C)
14.2
D)
-14.2
Answer:
D
A)
B)
C)
D)
26)
A second order high-pass filter has a low-end roll-off of ________.
26)
A)
60 dB/octave
B)
6 dB/decade
C)
40 dB/decade
D)
20 dB/octave
Answer:
C
A)
B)
C)
D)
27)
A constant-gain multiplier has three stages and a total gain of 22,200. For all three feedback
resistors, Rf= 470 k. Two of the R1 resistor have a value of 33 k. What is the gain of the stage
where R1 is unknown?
27)
A)
109
B)
-14.2
C)
14.2
D)
-109
Answer:
A
A)
B)
C)
D)
8
page-pf9
28)
If all resistances in this circuit are equal, the output is ________.
28)
A)
V2-V1
B)
V1×V2
C)
V1+V2
D)
V1-V2
Answer:
D
A)
B)
C)
D)
29)
Determine the gain of this circuit.
29)
A)
-10
B)
1.1
C)
10
D)
11
Answer:
D
A)
B)
C)
D)
9
page-pfa
30)
This circuit is known as a ________.
30)
A)
noninverting amplifier
B)
high-pass filter
C)
voltage buffer
D)
low-pass filter
Answer:
C
A)
B)
C)
D)
31)
An active filter that provides a constant output for input signals above fol is called an ideal
________.
31)
A)
bandpass filter
B)
low-pass filter
C)
high-pass filter
D)
None of the above
Answer:
C
A)
B)
C)
D)
32)
This op-amp is connected as a(n) ________.
32)
A)
voltage buffer
B)
noninverting constant-gain multiplier
C)
inverting constant-gain multiplier
D)
None of the above
Answer:
C
A)
B)
C)
D)
10
page-pfb
33)
The output voltage, Vo, is given by ________.
33)
A)
Vo=R3
R1+ R3
R2+Rf
R2V1-Rf
R2V2
B)
Vo= -V1Rf
R1+V2Rf
R2
R3
C)
Vo= - Rf
R2V2-R2
f
R1R3V1
D)
None of the above
Answer:
C
A)
B)
C)
D)
34)
Which one of the following expressions model the function of a voltage-controlled current source?
34)
A)
Io= kVi
B)
Io= kIi
C)
Vo= kIi
D)
Vo= kVi
Answer:
A
A)
B)
C)
D)
11
page-pfc
35)
For this cascade amplifier, the input voltage swing is 0.2 VPP. Calculate the peak-to-peak swing on
the output voltage.
35)
A)
4.8 VPP
B)
9.6 VPP
C)
2.4 VPP
D)
1.2 VPP
Answer:
A
A)
B)
C)
D)
36)
An active filter that provides a constant output for input signals from fol to foh is called an ideal
________.
36)
A)
bandpass filter
B)
low-pass filter
C)
high-pass filter
D)
None of the above
Answer:
A
A)
B)
C)
D)
37)
An op-amp bandpass active filter provides a constant output ________.
37)
A)
from dc to infinite frequency
B)
from fol to foh
C)
from dc to foh
D)
for all frequencies higher then fol
Answer:
B
A)
B)
C)
D)
12
page-pfd
Answer Key
Testname: C11
1)
D
2)
A
3)
C
4)
D
5)
A
6)
D
7)
B
8)
B
9)
D
10)
D
11)
A
12)
C
13)
D
14)
A
15)
D
16)
C
17)
D
18)
D
19)
A
20)
A
21)
B
22)
A
23)
C
24)
B
25)
D
26)
C
27)
A
28)
D
29)
D
30)
C
31)
C
32)
C
33)
C
34)
A
35)
A
36)
A
37)
B

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