ISRO Electrical Engineering (EE) 2023 - Question 3

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Determine pitch factor for winding: 36 stator slots, 4 poles, coil span 1 to 6.

  • A. cos 20°
  • B. cos 40°
  • C. cos 30°
  • D. cos 80°

Answer: B. cos 40°

Explanation: 36 slots/4 poles = 9 slots per pole (180°); coil span 5 slots = 100° electrical, so kp = sin(100°/2) = sin 50° = cos 40°.

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