Transformers
The output current corresponding to the maximum efficiency for a transformer having core loss of 200 W and equivalent resistance referred to secondary of 0.5 Ω is

20 A
5 A
10 A
15 A

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Transformers
No-load current of a transformer has

has high magnitude and high power factor
has small magnitude and low power factor
has small magnitude and high power factor
has high magnitude and low power factor

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