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For a given torque, increasing diverter resistance of a DC series motor causes the ________(a) decrease in speed and less armature current(b) decrease in speed but armature current remains the same(c) increase in speed and more armature current(d) increase in speed but armature current remains the sameI got this question in homework.Question is from Dynamic Braking of DC Series Motors in chapter Braking of DC Motors & Induction Motors of Electric Drives

Answer»

Right option is (a) decrease in speed and less armature current

Explanation: In DC series motor, INCREASING diverter resistance increases the field current and field FLUX and ALSO DECREASES the armature current and therefore decreases the speed.



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