Important Electrical Machine Design Multiple Choice Questions and Answers

36.  DC Machines provided with a large value of air gap length

   A. Provides comparatively quite operation

   B. Provides better ventilation.

   C. Provides poor ventilation

   D. Both A or B

37.  The air gap provided in DC machines of smaller diameters and provided with lesser number of poles is comparatively

   A. Smaller

   B. Longer

   C.Medium

   D. Any of the above

38.  DC machines designed with a large value of air gap length

   A. Provides better ventilation

   B. Reduces the pulsation losses

   C. Reduces the distortion effect

   D. All of the above

39.  Use of large core length in a DC machine

   A. Reduces the cost of the machine

   B. Results in bad communication

   C. Facilitates ventilation

   D. Both A or B

40.  Number of parallel path for a four pole duplex lap winding will be

   A. 2

   B. 4

   C. 6

   D. 8

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