A 20kW, 200V dc shunt motor has an electrical efficiency of 86% and an armature resistance of 0.25Ω. What is the value of the field current (in

divided by rpm. Torque equals horsepower 5252 a. b. horsepower x 5252 voltage x horsepower C. d.

A compound motor short draw a current of 50 A at a voltage of 220 V it rotates at a speed of 1200 rpm Calculate the reverse electromotive force if the resistance of the product is 0.04 ohm the resistance of the series windings is 0.01 ohm and the resistance of the parallel windings is 125 ohm then Calculate the torque generated

A 350 V shunt motor runs at it's normal speed of 720 r/min when the armature current is 90 A. The resistance of the armature is 0.3 ohm. Determine the following: (1) The kΦ1 of the motor. If armature current is 45 A and a resistance of 0.4 ohm is connected in series with the armature and the shunt field remaining constant determine the following: (2) The new kΦ2 of the motor. (3) The new speed of the motor in r/min If the current is 45 A and the shunt field is reduced to 75% of it's normal value by increasing resistance in the field circuit, determine the following: (4) The new kΦ2 of the motor. (5) The new speed of the motor in r/min