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The yoke of a dc machine serves to

  • A.provide the ventilation path for cooling air through the machine
  • B.carry the flux between the poles and support them mechanically
  • C.carry the armature current between the brushes and the terminals
  • D.insulate the field winding from the frame of the machine

Answer: B

It completes the magnetic circuit outside the poles and gives the whole machine its mechanical strength, which is why it is a substantial casting or fabrication. Cast steel has replaced cast iron because its permeability allows a smaller section.

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