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A dc generator's armature winding is placed on the rotor rather than the stator because

  • A.the field winding would not fit on the rotating member
  • B.the commutator can only be mounted on a stationary part
  • C.the armature current is smaller than the field current
  • D.the conductors must move relative to the flux to generate emf

Answer: D

Relative motion between conductor and flux is what induces the emf, and rotating the conductors through a stationary field is the simplest arrangement to commutate. An ac machine reverses that choice, putting the armature on the stator.

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