Important Electrical Machine Design Multiple Choice Questions and Answers

11.  Silicon content in iron lamination is kept within 5% as it

   A. Increases hysteresis loss

   B. Increases cost

   C. Makes the material brittle

   D. Reduces the curie point

12.  Commercial available medium size machines have a speed range of

   A. 200 to 400 rpm

   B. 600 to 1000 rpm

   C. 1000 to 1500 rpm

   D. 2000 to 2500 rpm

13.  Electrical machines having a power output up to about 750 W may be called .........machines

   A. Small size

   B. Medium-size

   C. Large size

   D. Any of the above

14.  The action of electromagnetic machines can be related to which of the following basic principles ?

   A. Induction

   B. Interaction

   C. Alignment

   D. All of the above

15.  The heated parts of an electrical machine dissipate heat into their surroundings by which off the following modes of heat dissipation?

   A. Conduction

   B. Convection

   C. Radiation

   D. All of the above

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