Question

5. A 230 V d.c. series motor runs at 900 rpm when the current is 30 A. The total resistance of the armature
and field circuits is 08 2. Calculate the value of the additional resistance required in series with the
machine to reduce the speed to 500 rp.m. if the gross torque is (1) constant (ii) proportional to speed (iii)
proportional to the square of the speed. Assume the magnetic circuit to be saturated​

Answer 1

Explanation:

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