Important Electrical Machine Design Multiple Choice Questions and Answers

36.  Since hydrogen has density 1/14th of that of air so it reduces

   A. Windage loss

   B. Noise

   C. Efficiency

   D. Both A and B

37.  The system adopted for cooling of turbo machines is

   A. Open circuit ventilation

   B. Closed circuit air cooling

   C. Closed circuit hydrogen cooling

   D. None of the above

38.  With conventional hydrogen cooling it is possible to increase the rating of a machine up to

   A. 50 MW

   B. 100 MW

   C. 200 MW

   D. 600 MW

39.  With direct water cooling it is possible to have rating up to

   A. 600 MW

   B. 400 MW

   C. 200 MW

   D. 100 MW

40.  Direct water cooling of rotor winding creates....... mechanical difficulties

   A. No

   B. Lesser

   C. Greater

   D. None of the above

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