Operational Amplifier Fundamentals – Exercise – 2

76. A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB?

(a) 51.7 dB
(b) 103.5 dB
(c) 150,000 dB
(d) 5.18 dB

Answer
Answer : (b)
Explanation
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77. An RC network has R = 47 kΩ and C = 0.22 μF. What is the cutoff frequency?

(a) 154 Hz
(b) 1540 Hz
(c) 1.54 Hz
(d) 15.4 Hz

Answer
Answer : (d)
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78. 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 ________.

(a) 10 dB.
(b) 6 dB.
(c) 20 dB.
(d) 3 dB.

Answer
Answer : (c)
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79. 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
Answer : (d)
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80. Which of the following is (are) the result of gain reduction by a feedback?

(a) The amplifier voltage gain is a more stable and precise value.
(b) The input impedance of the circuit is increased over that of the op-amp alone.
(c) The output impedance is reduced over that of the op-amp alone.
(d) All of the above

Answer
Answer : (d)
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