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A dc shunt motor is running at 1000 rpm at the rated load torque. If we reverse the filed winding 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 filed winding 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

I got this question in homework.

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

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Best answer
Correct choice is (a) direction of rotation reverses and commutation will be unaffected

Best explanation: Reversing the field will change the direction of rotation but will not affect the commutation.

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