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Answer :

Natural oil cooling is used for transformers up to a rating of 3000 kVA.

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Answer : Natural air cooling is generally restricted for transformers up to 1.5 MVA .

Description : Why a transformer requires cooling. What are the methods of cooling transformers?

Answer : Ans. Transformers requires cooling as they get heated up due to various losses taking place in the transformer. (like iron of copper losses) Following are the methods of cooling of transformer. a. Natural ... . Forced oil air Natural Cooling (OFAN). d. Forced oil and forced Air cooling (OFAF).

Answer : A common method of cooling a power transformer is oil cooling.

Description : Which of the following is used for thermoelectric cooling? A) Peltier effect B) Seebeck effect C) Both A and B D) None of these

Answer : Which of the following is used for thermoelectric cooling? A) Peltier effect B) Seebeck effect C) Both A and B D) None of these

Answer : Distribution transformers are generally designed for maximum efficiency around 50% load.