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
14.
Transformers are used to
Answer : D. step up or step down AC voltage
15.
Galvanometer can be converted into a voltmeter by using
Answer : B. a high resistance in series
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
17.
Which one of the following common devices works on the basis of the principle of mutual induction?
Answer : B. Transformer
18.
The electric device with thermostat is
Answer : D. iron box
