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With a capacitive load drawing a leading current, the effect of armature reaction on the main field is

  • A.purely cross-magnetising
  • B.absent entirely at any leading power factor
  • C.mainly magnetising
  • D.mainly demagnetising

Answer: C

Correct answer: mainly magnetising

A leading current puts the armature mmf nearly in line with the main field, so it adds to it and the terminal voltage rises with load. The regulation may then be negative - the terminal voltage on load exceeding that at no load - which is one of the reasons a lightly loaded cable network can overexcite a generator.

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