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What is the range of the working temperature of oil determined by the tests?

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What is the range of the working temperature of oil determined by the tests?

(a) 40-60° C

(b) 30-60° C

(c) 45-60° C

(d) 50-60° C

This question was addressed to me in my homework.

This interesting question is from Temperature Rise in Transformers in chapter Design of Transformers of Design of Electrical Machines

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Correct answer is (d) 50-60° C

Easy explanation: The minimum value of the working temperature of oil as cooling medium is determined to be 50°C. The maximum value of the working temperature of oil as cooling medium is determined to be 60°C.

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