Discussion
A compound dc motor has
Answer: D
Correct answer: both a series and a shunt field winding
A compound machine carries a shunt field of many fine turns across the armature and a series field of few heavy turns carrying the load current. Connected cumulatively, the series field strengthens the flux as load rises, giving a large starting torque with the shunt field still preventing runaway at no load - the combination of series and shunt virtues that makes the compound motor suit presses, shears and rolling mills.
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