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While conducting testing on the single phase transformer, one of the student tries to measure the resistance by putting an ammeter across one terminal of primary and other to secondary, the reading obtained will be ___________

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While conducting testing on the single phase transformer, one of the student tries to measure the resistance by putting an ammeter across one terminal of primary and other to secondary, the reading obtained will be ___________

(a) infinite

(b) zero

(c) finite

(d) negative finite

The question was posed to me in a national level competition.

I need to ask this question from Voltage Regulation of Transformer topic in section Transformers of Electrical Machines

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Correct answer is (a) infinite

The explanation: As the primary and secondary are physically isolated, the impedance will be infinite for not electrically connected circuit.

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