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A dc shunt motor is running at 1000 rpm at the rated load torque. If we reverse the supply terminals, then the __________

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A dc shunt motor is running at 1000 rpm at the rated load torque. If we reverse the supply terminals, then the __________

(a) direction of rotation reverses and commutation will be unaffected

(b) direction of rotation will be same and commutation will be unaffected

(c) direction of ration reverses and commutation will be affected

(d) direction of ration will be same and commutation will be affected

This question was posed to me in unit test.

This question is from MMF and Flux Density Waveforms in DC Machines topic in portion DC Machines of Electrical Machines

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Right choice is (b) direction of rotation will be same and commutation will be unaffected

Best explanation: Reversing the supply in dc machine will not change the direction of rotation and will not affect the commutation too.

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