Transformers
When secondary of a current transformer is open-circuited its iron core will be

hot because primary will carry heavy current
none of above will happen
cool as there is no secondary current
hot because of heavy iron losses taking place in it due to high flux density

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Transformers
No-load current of a transformer has

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

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