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A salient pole synchronous machine has an extra torque term proportional to

  • A.\( \sin\delta \)
  • B.\( \sin 2\delta \)
  • C.\( \cos\delta \)
  • D.\( \delta^2 \)

Answer: B

Difference between the direct and quadrature reactances gives a reluctance torque that peaks at forty-five degrees. It shifts the pull-out point below ninety degrees and lets the machine develop some torque even without excitation.

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