Electrical Engineering MCQs

Page No. 74

The differential gain is _____________?


avery high


bvery low


cdependent on input voltage


dabout 100


View Answer very high

When a differential amplifier is operated single-ended, _______________?


a the output is grounded


b one input is grounded and signal is applied to the other


c both inputs are connected together


d the output is not inverted



With zero volts on both inputs, an OP-amp ideally should have an output _______________?


aequal to the positive supply voltage


bequal to the negative supply voltage


cequal to zero


dequal to CMRR


View Answer equal to zero

In the common mode, _______________?


aboth inputs are grounded


b the outputs are connected together


can identical signal appears on both the inputs


dthe output signal are in-phase



A differential amplifier______________?


ais a part of an Op-amp


bhas one input and one output


chas two outputs


danswers (A) and (B)


View Answer answers (A) and (B)

The tail current of a differential amplifier is_______________?


ahalf of either collector current


b equal to either collector current


ctwo times either collector current


dequal to the difference in base currents



A certain inverting amplifier has a closed-loop voltage gain of 25. The Op-amp has an open-loop voltage gain of 100,000. If an Op-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain________________?


a doubles


bdrops to 12.5


cremains at 25


d increases slightly


View Answer remains at 25

The use of negative feedback ________________?


areduces the voltage gain of an Op-amp


b makes the Op-amp oscillate


cmakes linear operation possible


danswers (A) and (B)


View Answer answers (A) and (B)

A certain OP-amp has bias currents of 50 µA. The input offset current is_________________?


a700 nA


b 99.3 µA


c49.7 µA


d none of these


View Answer 700 nA

If the feedback resistor in Q15 (above question) is open, the voltage gain ____________?


aincreases


b decreases


cis not affected


ddepends on Ri


View Answer increases

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