Question

Statement I: Soft iron is used as a core of transformer.
Statement II: Area of hysteresis loop for soft iron is small.

• A. If both statements are true and statement II is the correct explanation of statement I.
• B. If both statements are true but statement II is not the correct explanation of statement I.
• C. If statement I is true but statement II is false.
• D. If statement I is false but statement II is true.

Answer 1

Answer: (A)

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.