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Armature reaction is more severe in a machine with

  • A.a lightly saturated magnetic circuit
  • B.a heavily saturated magnetic circuit
  • C.a very small air gap between rotor and poles
  • D.a very large number of commutator segments

Answer: A

In a lightly saturated machine the distortion is large because the iron responds readily, and the flux redistributes freely. A heavily saturated circuit resists the redistribution, though it then shows a larger net demagnetising effect.

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