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Torque-current characteristic of DC cumulative compound motor _____________

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Torque-current characteristic of DC cumulative compound motor _____________

(a) Lies above shunt motor characteristic

(b) Lies below shunt motor characteristic

(c) Lies above of series and shunt motor characteristic both

(d) Lies between of series and shunt motor characteristic both

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This question is from Operating Characteristics of DC Compound Motor in chapter Characteristics of DC Motors of DC Machines

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Correct choice is (c) Lies above of series and shunt motor characteristic both

Easiest explanation: Starting from zero armature current the characteristic of cumulative motor lies above the series characteristic and shunt characteristic, because it is the sum of series and shunt characteristic.

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