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Answer :

Star/star transformers work satisfactorily when load is balanced .

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Answer : Delta/star transformer works satisfactorily when on balanced as well as unbalanced loads.

Description : State and justify which of the following two transformers is better:  Transformer A = 4% voltage regulation  Transformer B = 6% voltage regulation

Answer : 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.

Answer : Transformer breaths in when load on it decreases.

Answer : When a given transformer is run at its rated voltage but reduced frequency, its core flux density is increased.

Description : When secondary of a current transformer is open-circuited its iron core will be?

Answer : When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.