Transformers
A no-load test is performed on a transformer to determine

core loss
magnetising current
copper loss
magnetising current and loss
efficiency

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Transformers
In a power or distribution transformer about 10 per cent end turns are heavily insulated

to absorb the line surge voltage and save the winding of transformer from damage
None of these
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns
to reflect the line surge and save the winding of a transformer from damage

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