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An equalizer connection is required when compound generators are paralleled because

  • A.the commutators of the two machines would otherwise spark
  • B.a small imbalance would otherwise run away through the series fields
  • C.the shunt fields of the two machines would otherwise oppose each other
  • D.the armature reaction of the two machines would otherwise add

Answer: B

If one machine takes a little more current, its series field strengthens, its emf rises and it takes more still, which is unstable. A heavy conductor joining the two series field ends forces them to share the current and stops the runaway.

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