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A shunt dc motor has its field winding connected

  • A.to a separate supply independent of the armature circuit
  • B.to the shaft of the machine through a small auxiliary generator
  • C.across the armature terminals
  • D.in series with the armature so that it carries the armature current

Answer: C

Correct answer: across the armature terminals

A shunt field is connected in parallel with the armature, so it sees the terminal voltage and carries a small current through many fine turns. Because the flux is then nearly independent of load, the speed falls only slightly as load is applied - the shunt motor is the approximately constant-speed dc machine. A series field carries the full armature current, and a separately excited field has its own supply.

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