Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: Soft iron is used as a core of transformer. Reason: Area of hysteresis loop for soft iron is small.A) if the Assertion and Reason are true and Reason is the correct explanation of Assertion
B) if both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C) if Assertion is true but Reason is false
D) if both Assertion and Reason are false
Correct Answer: A
Solution :
Hysteresis loss in the core of transformer is directly proportional to the hysteresis loop area of the core material. Since soft iron has narrow hysteresis loop area, that is why soft iron core is used in the transformer.
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