Transformers
In a transformer routine efficiency depends upon

Power factor of load
Supply frequency
Load current
Both power factor and load current

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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 reflect the line surge and save the winding of a 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

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