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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