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

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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

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cAs a number

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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

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bThere is hum in the output

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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

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b Loading effect of the next stage

✓


cThe use of many transistors

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dThe use of many capacitors

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A current amplification of 2000 is a gain of_________________?


a 3 db

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b 66 db

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c. 20 db

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d200 db

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View Answer 66 db

The purpose of RC or transformer coupling is to_____________?


aBlock a.c.

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b Separate bias of one stage from another

✓


c Increase thermal stability

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dNone of the above

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


a 1 µF

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b100 pF

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c0.01 µF

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d. 50 µF

✓


View Answer . 50 µF

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