Transformers
How are transformers generally cooled for installations rated at less than 5kVA ?

Oil cooled
Water cooled
Air cooled
None of the listed here

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Transformers
The efficiency of a transformer, under heavy loads, is comparatively low because

secondary output is much less as compared to primary input
iron loss is increased considerably
voltage drop both in primary and secondary becomes large
copper loss becomes high in proportion to the output

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