Question

1. A series motor takes 20 A at 400 V and runs at 250 rpm. The armature resistance is 0.6 ohm and field resistance is 0.4 ohm. The torque required by the device varies as the square of the speed. Find the applied voltage and the current to run this device at 350 rpm. 2. A 250 V, 15 kW shunt motor has a maximum efficiency of 88% and a speed of 700 rpm when delivering 80% of its rated output. The resistance of its shunt field is 100 ohms. Determine the efficiency and speed when the motor draws a current of 78 A from mains.

          1. A series motor takes 20 A at 400 V and runs at 250 rpm. The armature resistance is 0.6 ohm and field resistance is 0.4 ohm. The torque required by the device varies as the square of the speed. Find the applied voltage and the current to run this device at 350 rpm.
2. A 250 V, 15 kW shunt motor has a maximum efficiency of 88% and a speed of 700 rpm when delivering 80% of its rated output. The resistance of its shunt field is 100 ohms. Determine the efficiency and speed when the motor draws a current of 78 A from mains.

1 a series motor takes 20 a at 400 v and runs at 250 rpm the armature resistance is 06 ohm and field resistance is 04 ohm the torque required by the device varies as the square of the speed 55035

Added by Christopher M.

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