Important Electrical Machine Design Multiple Choice Questions and Answers


41.  Machines cooled by direct cooling method may be called


   A. Supercharged

   B. Inner cooled

   C. Contactor cooled

   D. Any of the above


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D. Any of the above

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42.  With direct water cooling it is possible to have ratings of about


   A. 200 MW

   B. 300 MW

   C. 400 MW

   D. 600 MW


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D. 600 MW

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43.  The density of hydrogen is ........times that density of air


   A. 0.07

   B. 1.5

   C. 2.5

   D. 3.5


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A. 0.07

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44.  Hydrogen has a heat transfer coefficient .......times that of air


   A. 1.5

   B. 2.5

   C. 3.5

   D. 4.5


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A. 1.5

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45.  The thermal conductivity of hydrogen is .......times that of air


   A. 2

   B. 3

   C. 5

   D. 7


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D. 7

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