Transformers
Sumpner's test is conducted on transformer to determine

None of the listed here
All day efficiency
Stray losses
Temperature

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

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