Star/star transformers work satisfactorily when load is balanced .
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.