Electrical Engineering MCQs

Page No. 135

The most commonly used semiconductor in the manufacture of a transistor is_____________?


agermanium


b silicon


ccarbon


dnone of the above


View Answer silicon

If voltage feedback (negative) is applied to an amplifier, its output impedance ______________?


aRemains the same


b Is increased


c Is decreased


dNone of the above


View Answer Is decreased

The voltage gain of an emitter follower is _____________?


aMuch less than 1


b Approximately equal to 1


cGreater than 1


dNone of the above



The collector-base junction in a transistor has___________?


a forward bias at all times


b reverse bias at all times


c low resistance


d none of the above



A heat sink is generally used with a transistor to______________?


a increase the forward current


bdecrease the forward current


ccompensate for excessive doping


dprevent excessive temperature rise



In a transistor, signal is transferred from a___________circuit?


ahigh resistance to low resistance


b low resistance to high resistance


chigh resistance to high resistance


d low resistance to low resistance



The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is applied, the gain of the amplifier will become______________?


a5 db


b300 db


c103 db


d 97 db


View Answer 97 db

A transistor is connected in CB mode. If it is not connected in CE mode with same bias voltages, the values of IE, IB and IC will____________?


aremain the same


bincrease


cdecrease


d none of the above


View Answer remain the same

When current feedback (negative) is applied to an amplifier, its output impedance ________________?


a Is increased


b Is decreased


cRemains the same


dNone of the above


View Answer Is increased

IC = [a / (1 – a )] IB + [___________ / (1 – a )?


aICBO


b ICEO


c IC


dIE


View Answer ICBO

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