Important Electrical Machine Design Multiple Choice Questions and Answers

1.  Number of parallel paths in a DC machine with duplex wave winding is

   A. 2

   B. 4

   C. 8

   D. 16

2.  In DC machines

   A. The number of slots per pole pair should be an odd integer

   B. The number of slots per pole should be at least 9

   C. The number of slots per pole usually lies between 9 and 16

   D. All of the above

3.  The DC machines, the slot pitch usually lies between

   A. 25 to 35 mm

   B. 50 to 60 mm

   C. 15 to 25 mm

   D. 10 to 15 mm

4.  Use of high current density increases

   A. Copper cost

   B. copper losses

   C. Temperature rise

   D. All of the above

5.  The commutator segment pitch should not be less than

   A. 0.4 mm

   B. 4 mm

   C. 2 mm

   D. 8 mm

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