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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C. Closed circuit hydrogen cooling

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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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C. 200 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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A. 600 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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C. Greater

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