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Compared to the natural cooling, how much of heat dissipation is increased by air blast cooling?

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in Design of Electrical Machines by (687k points)
Compared to the natural cooling, how much of heat dissipation is increased by air blast cooling?

(a) 50-70%

(b) 60-70%

(c) 50-60%

(d) 40-60%

I got this question in an interview for internship.

My question is from Methods of Cooling of Transformers in division Design of Transformers of Design of Electrical Machines

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The correct option is (c) 50-60%

Explanation: Air blast cooling helps in increased heat dissipation. The minimum value of increased heat dissipation is 50% and maximum value is 60%.

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