Operational Amplifier Fundamentals – Exercise – 3

146. The input offset current equals the

(a) average of two base currents
(b) collector current divided by the current gain
(c) difference between two base-emitter voltages
(d) difference between two base currents

Answer
Answer : (d)
Explanation
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147. If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?

(a) Common-mode
(b) Single-ended
(c) Double-ended
(d) Noninverting mode

Answer
Answer : (b)
Explanation
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148. The common-mode voltage gain is

(a) smaller than differential voltage gain
(b) equal to voltage gain
(c) greater than differential voltage gain
(d) None of the above

Answer
Answer : (a)
Explanation
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149. All of the following are basic op-amp input modes of operation EXCEPT

(a) inverting mode
(b) common-mode
(c) double-ended
(d) single-ended

Answer
Answer : (a)
Explanation
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150. Switching voltage regulators have ______ than linear regulators.

(a) longer life
(b) simpler circuitry
(c) greater efficiency
(d) lower cost

Answer
Answer : (c)
Explanation
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