Question: Rheostatic braking is employed with a 4 - pole dc separately excited motor driving a load. The armature is wave wound and has 2 5

Rheostatic braking is employed with a $4 -$ pole dc separately excited motor driving a load. The armature is wave wound and has $251$ conductors. The moment of inertia of the motor as well as the load is $350$ kg $.$ m $2$ $.$

The armature resistance is $0.02 \$ Omega $.$ Flux per pole is constant at $0.02$ Wb $.$ Calculate the time taken to reduce the speed from $100$ rpm to $1$ rpm $.$ Armature current is $300$ A and constant until the entire external resistance is cut out.

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