Important Electrical Machine Design Multiple Choice Questions and Answers

21.  The class of insulation employed for a larger rating high-voltage alternators is

   A. B

   B. C

   C. E

   D. F

22.  An ideal insulating material should have low

   A. Dielectric strength

   B. Dielectric loss

   C. Insulation resistance

   D. Thermal conductivity

23.  Excessive insulation is harmful to a coil because

   A. It increases the cost

   B. Copper losses are increased

   C. Heat transfer becomes poor

   D. Dielectric strength is reduced

24.  Maximum temperature limit for class B insulation is

   A. 105⁰C

   B. 120⁰C

   C. 130⁰C

   D. 155⁰C

25.  The basic considerations in the design of insolation are

   A. Mechanical considerations

   B. Electrical considerations

   C. Thermal consideration

   D. All of the above

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