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For strong series field, speed-torque characteristic of cumulative compound motor lies __________

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For strong series field, speed-torque characteristic of cumulative compound motor lies __________

(a) Above series motor characteristic if current is less than full load current

(b) Above shunt motor characteristic if current is less than full load current

(c) Below series motor characteristic if current is more than full load current

(d) Below series motor characteristic if current is less than full load current

I had been asked this question in exam.

Asked question is from Operating Characteristics of DC Compound Motor in portion Characteristics of DC Motors of DC Machines

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The correct choice is (b) Above shunt motor characteristic if current is less than full load current

Easy explanation: Due to strong series field, speed-torque characteristic lies above of shunt field characteristic but below of series field characteristic, as no-load speed is finite for cumulative compound motor, at armature current less than full load current.

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