Electrical Engineering MCQs

Page No. 124

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


a Gate voltage


bDrain voltage


cSource voltage


dBody voltage


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


b Bandwidth


c Slew rate


dOpen-loop gain


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


b5 volts


c5/1 volts


d5/2 volts


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


cexactly unity but negative


dabout -10


View Answer greater than +100

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


afast turn-on


bfast turn-off


clarge collector-base reverse bias


dlarge emitter-base forward bias



In an op-amp differentiator:________________?


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


bthe amplitude of output is proportional to input


coutput occurs when input is finite and constant


d polarity of input and output is the same



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


a all resistors


b all transistors


call inductors


dall capacitors


View Answer all capacitors

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


anegligible input resistance and high output resistance


bhigh input resistance and low output resistance


cmedium input resistance and high output resistance


d low input resistance as well as output resistance



In a transistor leakage current mainly depends on__________?


adoping of base


b size of emitter


crating of transistor


d temperature


View Answer temperature

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


aIncrease in both input & output impedances


bDecreases in both input & output impedances


cIncrease in input impedance & decreases in output impedance


d Decrease in input impedance & increase in output impedance



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