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Part of the transformer which is most subject to damage from overheating is?
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Part of the transformer which is most subject to damage from overheating is winding insulation.

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In two part tariff, variation in load factor will affect operating or running charges.

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Even at no-load, a transformer draws current from the mains. Why?

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A transformer oil must be free from moisture.

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The transformer laminations are insulated from each other by thin coat of varnish.

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Transformer A with 4% voltage regulation is better.  Justification: Voltage regulation refers to the percentage change in secondary voltage when load is changed from no-load to full-load with primary voltage ... 4% voltage regulation, which is less as compared to 6% of transformer B, it is better.

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In the transformer low voltage winding has got more cross-sectional area.

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High voltage winding in a transformer has more number of turns.

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High voltage winding of the transformer has less cross-sectional area.

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An ideal transformer is one which has no losses and magnetic leakage.

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 Sandwich type winding is used in 3 phase shell-type transformer.

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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

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In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

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The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

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If the supply frequency to the transformer is increased, the iron loss will increase.

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A transformer can have regulation closer to zero on leading power factor.

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The hum in a transformer is mainly attributed to magnetostriction.

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