1.

Assertion : Transformers are used only in alternating current source not in direct current. Reason : Only a.c. can be stepped up or down by means of transformers.

Answer»

If both ASSERTION and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reasonare false.

Solution :Trnasformers which convert low voltages into higher ones are called step-up transformers WHITE those which convert HIGH voltages into lower ones are called step-down transformers. This is POSSIBLE only for a.c. source and not for d.c. source.


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