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
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D. Both A and B
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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
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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
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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
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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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