41. The midrange open-loop gain of an op-amp is 135 dB. With negative feedback this gain is reduced to 72 dB. The closed-loop gain is ________.
(a) 135 dB.
(b) 72 dB.
(c) 207 dB.
(d) 63 dB.
42. Negative feedback added to an op-amp ________ the bandwidth and ________ the gain.
(a) increases, increases
(b) increases, decreases
(c) decreases, decreases
(d) decreases, increases
43. Nota
44. Nota
45. A voltage-follower amplifier comes to you for service. You find the voltage gain to be 5.5 and the input impedance 22 kΩ. 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.
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