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Electronics and Communications


7. 

Electronic devices that convert D.C. power into A.C. power are called

Answer : C. Inverters

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8. 

Which of the following is an insulator?

Answer : C. Glass

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9. 

A transformer

Answer : D. generates induced e.m.f.

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10. 

Can D.C. voltage be used in a transformer

Answer : B. no

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11. 

In a step-up transformer, the number of turns

Answer : B. in the secondary is more than in the primary

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12. 

Two wires have their lengths,diameters and resistivities, all in the ratio of 1:2. If the resistance of the thinner wire is 10ohms,the resistance of the thicker wire shall be

Answer : B. 10 ohms

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