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

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b Impedance matching

✓


cDistortionless output

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dGood frequency response

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View Answer Impedance matching

The most important consideration in power amplifier is __________________?


aBiasing the circuit

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bCollector efficiency

✓


cTo keep the transformer cool

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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

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cOnly voltage

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dNone of the above

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An AF amplifier is shielded to ________________?


a Keep the amplifier cool

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bProtect from rusting

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cPrevent induction due to stray magnetic fields

✓


dNone of the above

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The disadvantage of impedance matching is that it _______________?


aGives distorted output

✓


bGives low power output

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cRequires a transformer

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dNone of the above

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