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A single phase transformer of 2200/220 V having rated l.v. current of 150 A has to undergo open circuit test on h.v side. The instruments used are voltmeter of 200V and ammeter of 1A. Then the results ___________

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A single phase transformer of 2200/220 V having rated l.v. current of 150 A has to undergo open circuit test on h.v side. The instruments used are voltmeter of 200V and ammeter of 1A. Then the results ___________

(a) will be wrong

(b) will be accurate

(c) of ammeter will burn

(d) none of the mentioned

I have been asked this question in examination.

I would like to ask this question from Open Circuit and Short Circuit Test in chapter Transformers of Electrical Machines

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Correct choice is (c) of ammeter will burn

Explanation: The current in the h.v. winding will be around 10 A but the ammeter is of 1 A rating. So, it will burn off.

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