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A d.c. series motor consumes a 6.5 kW when it draws the armature current of 12.5 A. The armature resistance and field resistances are

A d.c. series motor consumes a 6.5 kW when it draws the armature current of 12.5 A. The armature resistance and field resistances are 3.3 Q and 2 2 respectively. Calculate: a. The supply voltage. b. Back EMF. c. Torque developed if the speed is 3560 rpm, by assuming the stray loss as 1.2 kW. [520 V, 453.75 V, 12 Nm]

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