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The critical speed of a shunt generator is the speed at which

  • A.the machine reaches its rated terminal voltage on no load
  • B.the armature reaction just cancels the main field
  • C.the residual magnetism of the poles is at its greatest
  • D.the magnetisation curve becomes tangent to the given field resistance line

Answer: D

Since the magnetisation curve scales with speed, reducing the speed lowers it until it no longer crosses the resistance line. Below the critical speed the machine will not build up whatever the field resistance is set to.

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