Question

For relatively large sizes of synchronous machines, which of the following are used for providing closed circuit cooling?

(a) air

(b) water

(c) hydrogen/helium

(d) any of the mentioned

The question was posed to me in a job interview.

This is a very interesting question from Constructional Features of Rotating Electrical Machines-3 topic in division Constructional Features of Rotating Electrical Machines of Electrical Machines

Answer 1

Correct answer is (d) any of the mentioned

To explain I would say: For synchronous machines of large sizes, adequate cooling arrangements must be incorporated to dissipate the heat produced by various losses.