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While estimating voltage regulation of a transformer, keeping ___________

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While estimating voltage regulation of a transformer, keeping ___________

(a) primary voltage constant

(b) secondary voltage constant

(c) voltage changes constant at primary

(d) all of the mentioned

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Asked question is from Voltage Regulation of Transformer in section Transformers of Electrical Machines

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The correct option is (a) primary voltage constant

Easiest explanation: V.R. is calculated keeping the primary constant because then the core flux will change and the change of secondary voltage can  not be fixed.

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