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What is the range of the flow rate of circulating oil per KW of losses?

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What is the range of the flow rate of circulating oil per KW of losses?

(a) 6-7 liters per minute

(b) 5-6 liters per minute

(c) 6-8 liters per minute

(d) 6-7 liters per minute

I got this question during an online interview.

My doubt stems from Methods of Cooling of Transformers in chapter Design of Transformers of Design of Electrical Machines

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Correct choice is (c) 6-8 liters per minute

Explanation: The minimum value of the flow rate of circulating oil per KW of losses is derived to be 6 liters per minute. The maximum value of the flow rate of circulating oil per KW of losses is derived to be 8 liters per minute.

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