Important Electrical Machine Design Multiple Choice Questions and Answers

31.  The diameter of hydro generated is as large as

   A. 2.5 m

   B. 5 m

   C. 10 m

   D. 15 m

32.  Turbo alternators are designed for the maximum peripheral speed of about

   A. 140 m/s

   B. 175 m/s

   C. 275 m/s

   D. 400 m/s

33.  .............cooling is most commonly used in hydro-generation

   A. Closed circuit

   B. Hydrogen gas

   C. Direct water

   D. Any of the above

34.  An ac winding has two slots for pole per phase. The slot harmonics will be

   A. 5 th and 7 th

   B. 11 th and 13 th

   C. 17 th and 19 th

   D. None of the above

35.  The slot leakage flux is more in case of

   A. Open type of slots

   B. Semiclosed sluts

   C. Closed slots

   D. Open slots with aluminium conductors

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