Which speed control will be desirable?

A DC shunt motor has rated rpm of Certain industrial application requires this motor to run at 540 rpm for some time. Which speed control will be desirable?

  1. It is not possible to run the motor at more than the rated rpm
  2. Armature current control
  3. Ward Leonard control
  4. Field resistance control
Anurag Mishra Professor Asked on 14th January 2016 in Physics.
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