Discussion
A dc shunt motor's speed-torque characteristic is described as
Answer: B
Correct answer: nearly flat, with a small droop
The shunt field is across the supply, so the flux is nearly constant and the speed falls only by the armature resistance drop as load is applied - typically a few per cent from no load to full load. That is why the shunt motor is the approximately constant-speed dc machine, suited to lathes, fans and pumps. The steeply falling hyperbola belongs to the series motor.
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