Electrical Engineering MCQs

Page No. 124

The effective channel length of a MOSFET in a saturation decreases with increase in___________?


a Gate voltage

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bDrain voltage

✓


cSource voltage

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dBody voltage

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View Answer Drain voltage

A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high_________?


a CMMR

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b Bandwidth

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c Slew rate

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dOpen-loop gain

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View Answer Slew rate

An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is [Hint: Slew rate is defined as the max. rate of change of output voltage. Its unit is V/μS.


a10 volts

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b5 volts

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c5/1 volts

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d5/2 volts

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View Answer 5/2 volts

A source follower using an FET usually has a voltage gain which is___________?


agreater than +100

✓


bslightly less than unity but positive

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cexactly unity but negative

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dabout -10

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View Answer greater than +100

The early effect in a bipolar junction transistor is caused by_______________?


afast turn-on

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bfast turn-off

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clarge collector-base reverse bias

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dlarge emitter-base forward bias

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In an op-amp differentiator:________________?


athe amplitude of output is proportional to rate of change of input

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bthe amplitude of output is proportional to input

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coutput occurs when input is finite and constant

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d polarity of input and output is the same

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In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?


a all resistors

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b all transistors

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call inductors

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dall capacitors

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View Answer all capacitors

When a transistor is connected in common emitter mode, it with have__________?


anegligible input resistance and high output resistance

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bhigh input resistance and low output resistance

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cmedium input resistance and high output resistance

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d low input resistance as well as output resistance

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In a transistor leakage current mainly depends on__________?


adoping of base

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b size of emitter

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crating of transistor

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d temperature

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View Answer temperature

Voltage Series feedback also called series-shunt feedback) results in__________?


aIncrease in both input & output impedances

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bDecreases in both input & output impedances

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cIncrease in input impedance & decreases in output impedance

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d Decrease in input impedance & increase in output impedance

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