Electrical Engineering MCQs

Page No. 15

If the power level of an amplifier reduces to half, the db gain will fall by___________?


a5 db


b 2db


c10 db


d 3 db


View Answer 3 db

In the initial stages of a multistage amplifier, we use______________?


aRC coupling


bTransformer coupling


cDirect coupling


dNone of the above


View Answer RC coupling

A gain of 1,000,000 times in power is expressed by_____________?


a 30 db


b60 db


c120 db


d600 db


View Answer 60 db

In transistor amplifiers, we use_____________transformer for impedance matching?


aStep up


b Step down


cSame turn ratio


dNone of the above


View Answer Step down

If a three-stage amplifier has individual stage gains of 10 db, 5 db and 12 db, then total gain in db is____________?


a600 db


b24 db


c14 db


d27 db


View Answer 27 db

Transformer coupling is generally employed when load resistance is______________?


aLarge


bVery large


cSmall


d None of the above


View Answer Small

_____________coupling provides the maximum voltage gain?


aRC


bTransformer


cDirect


dImpedance


View Answer Transformer

In RC coupling, the value of coupling capacitor is about_______________?


a 100 pF


b0.1 µF


c0.01 µF


d10 µF


View Answer 10 µF

The best frequency response is of_____________coupling?


aRC


bTransformer


c Direct


dNone of the above


View Answer Direct

In obtaining the frequency response curve of an amplifier, the______________?


aAmplifier level output is kept constant


bAmplifier frequency is held constant


cGenerator frequency is held constant


dGenerator output level is held constant



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