Discussion
The pole shoes of a dc machine are shaped in order to
Answer: C
Correct answer: spread the flux over a larger area of the armature surface
The pole shoe is the widened foot of the pole, and its curved face spreads the flux over a large arc of the air gap, giving a more uniform flux density under the pole and reducing the reluctance of the magnetic circuit. It also supports the field coil mechanically and, in machines fitted with them, houses the compensating winding in slots cut in its face.
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