A 120-V, 2400-rpm shunt motor has an armature resistance of 0.4 Ωand a shunt field resistance of 160 Ω. The motor operates at its rated speed at full load and takes 14.75 A. The no-load current is 2 A. An external resistance of 80 Ω is inserted in series with the shunt field winding instead of the armature circuit, determine (a) the motor speed, (2907 rpm)(b) the power loss in the external resistance, and (20 W)(c) the efficiency. (84.8%)Assume that the flux is proportional to the square root of the field-winding current and the motor develops the same torque.

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A 120-V, 2400-rpm shunt motor has an armature resistance of 0.4 Ωand a shunt field resistance of 160 Ω. The motor operates at its rated speed at full load and takes 14.75 A. The no-load current is 2 A. An external resistance of 80 Ω is inserted in series with the shunt field winding instead of the armature circuit, determine (a) the motor speed, (2907 rpm)
(b) the power loss in the external resistance, and (20 W)
(c) the efficiency. (84.8%)
Assume that the flux is proportional to the square root of the field-winding current and the motor develops the same torque.

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