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A d.c. series motor drives a load at 30 rev/s and takes a current of 10 A when the supply voltage is 400 V.

A d.c. series motor drives a load at 30 rev/s and takes a current of 10 A when the supply voltage is 400 V. If the total resistance of the motor is 252 and the iron, friction and windage losses amount to 300 W, determine the efficiency of the motor.

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