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3. A 240 V DC series motor with 0.1 ohm armature resistance and 0.1 ohm field resistance runs at 1200 rpm and 100 Amp. of full load speed and armature current respectively. The motor has a brush contact drop of 2 volts. Find the motor full load torque and efficiency If the motor is to drive a pump that requires a torque of 150 NM, find the speed as the motor drives the given pump. a. b.

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