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Electronic Devices - Operational Amplifiers

Exercise : Operational Amplifiers - General Questions
6.
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.
800
8,000
80,000
100,000
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.

Refer to the given figure. The input impedance of this circuit is

500 k.
10 k.
50 k.
5 k.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
What is the level of the voltage between the input terminals of an op-amp?
Virtually zero
5 V
18 V
22 V
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
An op-amp has an open-loop gain of 75,000 and a cutoff frequency of 100 Hz. At 1 kHz the open-loop gain is down by
10 dB.
6 dB.
20 dB.
3 dB.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
What is the difference output voltage of any signals applied to the input terminals?
The differential gain times the difference input voltage.
The common-mode gain times the common input voltage.
The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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