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Electronics and Communications


13. 

The common emitter configuration is more preferred than the commonbase configuration because the common emitter configuration gives

Answer : C. high current gain, high voltage gain and highpower gain

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14. 

Transformers are used to

Answer : D. step up or step down AC voltage

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15. 

Galvanometer can be converted into a voltmeter by using

Answer : B. a high resistance in series

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16. 

When two resistors, each of value 10 ohms, are connected in parallel, what is the effective value of the combination?

Answer : B. 5 ohms

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17. 

Which one of the following common devices works on the basis of the principle of mutual induction?

Answer : B. Transformer

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18. 

The electric device with thermostat is

Answer : D. iron box

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