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Exam
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)
The ________ circuit overcomes the problem of false switching caused by noise on the input(s).
1)
A)
differentiator
B)
Schmitt trigger
C)
input buffer
D)
input noise eliminator
Answer:
B
Explanation:
A)
B)
C)
D)
2)
A D/A converter is an application of the
2)
A)
scaling adder.
B)
voltage-to-current converter.
C)
adjustable bandwidth circuit.
D)
noninverting amplifier.
Answer:
A
Explanation:
A)
B)
C)
D)
3)
Refer to (a) in the figure above. If VCC = 15 V, the approximate output voltage is
3)
A)
13 V.
B)
1 V.
C)
-13 V.
D)
-1 V.
Answer:
A
Explanation:
A)
B)
C)
D)
1
4)
Refer to (a) in the figure above. If a solder splash shorted the two ends of the feedback resistor to
each other, the output voltage would be
4)
A)
-0.5 V.
B)
0 V.
C)
-Vsat.
D)
0.5 V.
Answer:
B
Explanation:
A)
B)
C)
D)
5)
Each of the following is used to establish a reference voltage on a comparator input except a
5)
A)
LED.
B)
zener diode.
C)
voltage divider.
D)
battery.
Answer:
A
Explanation:
A)
B)
C)
D)
6)
Refer to (b) in the figure above. The output voltage with the inputs as shown is
6)
A)
26 Vp-p.
B)
17.06 Vp-p.
C)
+Vsat.
D)
-Vsat.
Answer:
A
Explanation:
A)
B)
C)
D)
7)
Refer to (b) in the figure above. This type of circuit will usually have
7)
A)
a square wave output if the input is a sine wave.
B)
a ramp output for a square wave input.
C)
a triangle wave output.
D)
None of the above.
Answer:
A
Explanation:
A)
B)
C)
D)
2
8)
The output of an op-amp differentiator with a rectangular input is a
8)
A)
ramp voltage.
B)
series of positive and negative spikes.
C)
sine wave.
Answer:
B
Explanation:
A)
B)
C)
9)
An integrator circuit
9)
A)
produces a ramp voltage at its output for a step input voltage.
B)
uses a capacitor in its feedback circuit.
C)
uses an inductor in its feedback circuit.
D)
A and B above.
Answer:
D
Explanation:
A)
B)
C)
D)
10)
A differentiator circuit
10)
A)
uses a resistor in its feedback circuit.
B)
uses a capacitor in its feedback circuit.
C)
produces a square wave at its output for a triangle wave input.
D)
A and C above.
Answer:
D
Explanation:
A)
B)
C)
D)
11)
A mathematical operation for finding the area under the curve of a graph is called
11)
A)
curve averaging.
B)
linear regression.
C)
integration.
D)
differentiation.
Answer:
C
Explanation:
A)
B)
C)
D)
3
12)
Refer to (b) in the figure above. If Vsat = +/
-12 V, the approximate output voltage is
12)
A)
-12 V.
B)
2 V.
C)
-2 V.
D)
12 V.
Answer:
A
Explanation:
A)
B)
C)
D)
13)
The amount of hysteresis in a Schmitt trigger is defined by
13)
A)
VUTP
VLTP .
B)
VUTP ×VLTP.
C)
VUTP +VLTP.
D)
VUTP -VLTP.
Answer:
D
Explanation:
A)
B)
C)
D)
14)
Output bounding is the process of ________ the output voltage range of a comparator.
14)
A)
extending
B)
comparing
C)
filtering
D)
limiting
Answer:
D
Explanation:
A)
B)
C)
D)
15)
See (a) in the figure above. This circuit is known as
15)
A)
a summing amplifier.
B)
an integrator.
C)
a differentiator.
D)
a noninverting amplifier.
Answer:
C
Explanation:
A)
B)
C)
D)
4
16)
If the value of resistor Rf in a averaging amplifier circuit is equal to the value of one input resistor
divided by the number of inputs, the output will be equal to the
16)
A)
inverted sum of the individual inputs.
B)
sum of the individual inputs.
C)
average of the individual inputs.
D)
inverted average of the individual inputs.
Answer:
D
Explanation:
A)
B)
C)
D)
17)
A Schmitt trigger is a comparator with
17)
A)
hysteresis.
B)
one trigger point.
C)
two trigger points.
D)
A and C above.
Answer:
D
Explanation:
A)
B)
C)
D)
18)
The formula IC=
VC
tC shows that for a given capacitor, if the voltage changes at a constant rate
with respect to time, then current will
18)
A)
decrease logarithmically.
B)
increase.
C)
decrease.
D)
be constant.
Answer:
D
Explanation:
A)
B)
C)
D)
19)
An R/2R ladder circuit would be found in a
19)
A)
D/A converter circuit.
B)
common emitter amplifier.
C)
differential amplifier.
D)
Schmitt trigger circuit.
Answer:
A
Explanation:
A)
B)
C)
D)
20)
A two-input summing amplifier has input voltages of 3 V and 4 V. If Rf is open, the output voltage
will be approximately
20)
A)
+7 V.
B)
-7 V.
C)
-Vsat.
D)
+Vsat.
Answer:
C
Explanation:
A)
B)
C)
D)
5
21)
In an op-amp integrator, the current through the input resistor is into the
21)
A)
bypass capacitor.
B)
noninverting input.
C)
inverting input.
D)
feedback capacitor.
Answer:
D
Explanation:
A)
B)
C)
D)
22)
The ________ input makes the summing amplifier circuit possible.
22)
A)
virtual ground at the noninverting
B)
high voltage
C)
virtual ground at the inverting
D)
low voltage
Answer:
C
Explanation:
A)
B)
C)
D)
23)
A zero crossing detector is a
23)
A)
comparator with a trip point referenced to zero.
B)
peak detector.
C)
comparator with no output.
D)
limiter.
Answer:
A
Explanation:
A)
B)
C)
D)
24)
A bounded comparator uses ________ in the feedback circuit.
24)
A)
equal-valued resistors
B)
an inductor
C)
a resonant filter
D)
zener diodes
Answer:
D
Explanation:
A)
B)
C)
D)
25)
The output of a Schmitt trigger is a
25)
A)
square wave.
B)
triangle wave.
C)
sine wave.
D)
sawtooth.
Answer:
A
Explanation:
A)
B)
C)
D)
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