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
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
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
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
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
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
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
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
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
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
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
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
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