Electrical Engineering MCQs

Page No. 16

In an RC coupling scheme, the coupling capacitor CC must be large enough______________?


aTo pass d.c. between the stages


bNot to attenuate the low frequencies


cTo dissipate high power


d None of the above



When a multistage amplifier is to amplify d.c. signal, then one must use_____________coupling?


a RC


bTransformer


cDirect


dNone of the above


View Answer Direct

In practice, voltage gain is expressed______________?


aIn db


b In volts


cAs a number


d None of the above


View Answer In db

The final stage of a multistage amplifier uses______________?


aRC coupling


b Transformer coupling


cDirect coupling


dImpedance coupling



RC coupling is not used to amplify extremely low frequencies because____________?


aThere is considerable power loss


bThere is hum in the output


cElectrical size of coupling capacitor becomes very large


d None of the above



1 db corresponds to_____________change in voltage or current level?


a40%


b80%


c 20%


d25%


View Answer 40%

The total gain of a multistage amplifier is less than the product of the gains of individual stages due to____________?


aPower loss in the coupling device


b Loading effect of the next stage


cThe use of many transistors


dThe use of many capacitors



A current amplification of 2000 is a gain of_________________?


a 3 db


b 66 db


c. 20 db


d200 db


View Answer 66 db

The purpose of RC or transformer coupling is to_____________?


aBlock a.c.


b Separate bias of one stage from another


c Increase thermal stability


dNone of the above



The value of emitter capacitor CE in a multistage amplifier is about____________?


a 1 µF


b100 pF


c0.01 µF


d. 50 µF


View Answer . 50 µF

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