26)
Hysteresis voltage is defined as
26)
A)
the voltage of the lower trigger point.
B)
the difference in voltage between the upper and the lower trigger points.
C)
the voltage of the upper trigger point.
D)
the sum of voltages of the upper and the lower trigger points.
Answer:
B
Explanation:
A)
B)
C)
D)
27)
A mathematical operation that determines the rate of change of a curve is called
27)
A)
differentiation.
B)
linear regression.
C)
curve averaging.
D)
integration.
Answer:
A
Explanation:
A)
B)
C)
D)
28)
If the input to a comparator is a sine wave, the output is a
28)
A)
sine wave.
B)
sawtooth wave.
C)
rectangular wave.
D)
ramp voltage.
Answer:
C
Explanation:
A)
B)
C)
D)
29)
A comparator is an example of a(n)
29)
A)
current source.
B)
nonlinear circuit.
C)
linear circuit.
D)
active filter.
Answer:
B
Explanation:
A)
B)
C)
D)
30)
A Schmitt trigger has
30)
A)
only negative feedback.
B)
a triangular output.
C)
two slightly different trip points.
D)
only one trip point.
Answer:
C
Explanation:
A)
B)
C)
D)
7
31)
Refer to the figure above. Which of these circuits is known as an integrator?
31)
A)
(a)
B)
(b)
C)
Neither of the above.
Answer:
B
Explanation:
A)
B)
C)
32)
A summing amplifier can add
32)
A)
dc voltages.
B)
dc to ac voltages.
C)
ac voltages.
D)
All of the above.
Answer:
D
Explanation:
A)
B)
C)
D)
33)
Refer to (b) in the figure above. A voltmeter placed from the inverting input to ground would read
33)
A)
2.775 V.
B)
–2.775 V.
C)
0 V.
D)
–0.925 V.
Answer:
C
Explanation:
A)
B)
C)
D)
8
34)
Refer to (a) in the figure above. This circuit is known as a
34)
A)
comparator with hysteresis.
B)
noninverting amplifier.
C)
multivibrator.
D)
zero level detector.
Answer:
A
Explanation:
A)
B)
C)
D)
35)
Refer to (b) in the figure above. A square wave input is applied to this circuit. The output voltage is
most likely to be
35)
A)
a square wave.
B)
a sine wave.
C)
a triangle wave.
D)
no output.
Answer:
C
Explanation:
A)
B)
C)
D)
36)
A Schmitt trigger is a comparator with
36)
A)
positive feedback.
B)
negative feedback.
C)
Neither A nor B.
D)
Both A and B.
Answer:
A
Explanation:
A)
B)
C)
D)
9
37)
An op–amp has an open–loop gain of 100,000. Vsat = +/
–12 V. A differential signal voltage of 150
µVp–p is applied between the inputs. The output voltage is
37)
A)
12 V.
B)
24 Vp–p.
C)
12 Vp–p.
D)
–12 V.
Answer:
B
Explanation:
A)
B)
C)
D)
38)
If all the resistors in a summing amplifier are equal, the output will be equal to the
38)
A)
sum of the individual inputs.
B)
inverted sum of the individual inputs.
C)
average of the individual inputs.
D)
inverted average of the individual inputs.
Answer:
B
Explanation:
A)
B)
C)
D)
39)
Refer to (c) in the figure above. With the inputs shown, the output voltage would be
39)
A)
7 V.
B)
–Vsat.
C)
+Vsat.
D)
–7 V.
Answer:
C
Explanation:
A)
B)
C)
D)
40)
An op–amp has an open–loop gain of 90,000. Vsat = +/
–13 V. A differential voltage of 0.1 Vp–p is
applied between the inputs. The output voltage is
40)
A)
13 Vp–p.
B)
13 V.
C)
26 Vp–p.
D)
–13 V.
Answer:
C
Explanation:
A)
B)
C)
D)
10
41)
A window comparator
41)
A)
detects an input voltage between two limits.
B)
clamps the input positively.
C)
has only one usable threshold.
D)
uses hysteresis to speed up response.
Answer:
A
Explanation:
A)
B)
C)
D)
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
42)
The output voltage of a summing amplifier is proportional to the product of the input voltages.
42)
Answer:
True
False
Explanation:
43)
A square wave input to an op–amp integrator will produce a sine wave output.
43)
Answer:
True
False
Explanation:
44)
Integration is a mathematical process for determining the area under a curve.
44)
Answer:
True
False
Explanation:
45)
Bounding allows the op–amp to have unlimited output voltage up to the value of the supply
voltages.
45)
Answer:
True
False
Explanation:
46)
An op–amp comparator has an output dependent upon the polarities of the two inputs.
46)
Answer:
True
False
Explanation:
11