Exercise: Operational Amplifiers

Questions for: Operational Amplifiers

What is the level of the voltage between the input terminals of an op-amp?
A:
Virtually zero
B:
5 V
C:
18 V
D:
22 V
Answer: A
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Refer to the given figure. The input impedance of this circuit is

A:
500 k.
B:
10 k.
C:
50 k.
D:
5 k.
Answer: C
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An op-amp has an open-loop gain of 100,000 and a cutoff frequency of 40 Hz. Find the open-loop gain at a frequency of 30 Hz.
A:
800
B:
8,000
C:
80,000
D:
100,000
Answer: D
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For an op-amp having a slew rate SR = 5 V/ms, what is the maximum closed-loop voltage gain that can be used when the input signal varies by 0.2 V in 10 ms?
A:
150
B:
200
C:
250
D:
300
Answer: C
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A voltage-follower amplifier comes to you for service. You find the voltage gain to be 5.5 and the input impedance 22 k. The probable fault in this amplifier, if any, is
A:
the gain is too low for this type of amplifier.
B:
the input impedance is too high for this amplifier.
C:
nothing is wrong. The trouble must be somewhere else.
D:
none of these.
Answer: D
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