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What is the usage of the tanks with tubes?

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in Design of Electrical Machines by (687k points)
What is the usage of the tanks with tubes?

(a) if the temperature rise with plain tank is very low

(b) if the temperature rise with plain tank is very high

(c) if the temperature rise is zero

(d) if the temperature rise with plain tank exceeds the specific limits

The question was asked in an interview for job.

Query is from Design of Tank topic in portion Design of Transformers of Design of Electrical Machines

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Correct choice is (d) if the temperature rise with plain tank exceeds the specific limits

The best I can explain: Temperature rise in transformers is calculated with plain walled tanks. If the limits is exceeded then the plain walled tank is replaced by tank with tubes.

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