Electrical Engineering MCQs

Page No. 23

What turn ratio (Np/Ns) of transformer is required to match 4 O speaker to a transistor having an output impedance of 8000 O ?


a2


b7


c3


dNone of the above


View Answer 7

For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?


a10 W


b4 W


c 8 W


dNone of the above


View Answer 4 w

The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used ?


a10 W


b15 W


c5 W


d20 W


View Answer 20 W

The class B push-pull circuit can deliver 100 W of a.c. output power. What should be the minimum power rating of each transistor ?


a20 W


b40 W


c10 W


d80 W


View Answer 20 W

Power amplifiers generally use transformer coupling because transformer permits______________?


aCooling of the circuit


b Impedance matching


cDistortionless output


dGood frequency response


View Answer Impedance matching

The most important consideration in power amplifier is __________________?


aBiasing the circuit


bCollector efficiency


cTo keep the transformer cool


dNone of the above


View Answer Collector efficiency

A transformer coupled class A power amplifier has a load of 100 O on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?


a5 kO


b20 kO


c100 kO


d10 kO


View Answer 10 kO

Transformer coupling can be used in______________amplifiers?


aEither power or voltage


bOnly power


cOnly voltage


dNone of the above



An AF amplifier is shielded to ________________?


a Keep the amplifier cool


bProtect from rusting


cPrevent induction due to stray magnetic fields


dNone of the above



The disadvantage of impedance matching is that it _______________?


aGives distorted output


bGives low power output


cRequires a transformer


dNone of the above



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