For a single phase transformer operating at normal operating conditions has useful flux of 1 Wb. If the machine is loaded at 0.8 p.f., then its mutual flux __________(a) may decrease to 0.98 Wb(b) remains constant(c) may increase 1.02 Wb(d) may decrease to 0.8 WbI have been asked this question by my school principal while I was bunking the class.The question is from Equivalent Circuit of Transformer in section Transformers of Electrical Machines

For a single phase transformer operating at normal operating condition

1.	For a single phase transformer operating at normal operating conditions has useful flux of 1 Wb. If the machine is loaded at 0.8 p.f., then its mutual flux __________(a) may decrease to 0.98 Wb(b) remains constant(c) may increase 1.02 Wb(d) may decrease to 0.8 WbI have been asked this question by my school principal while I was bunking the class.The question is from Equivalent Circuit of Transformer in section Transformers of Electrical Machines
Answer» The CORRECT answer is (a) may decrease to 0.98 Wb The EXPLANATION: The mutual FLUX will decrease by a very small amount.

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