A 350 V shunt motor runs at its 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:(a) The kΦ1 of the motor. (2)If...

A 350 V shunt motor runs at its 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: (a) The kΦ1 of the motor. (2) 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: (b) The new kΦ2 of the motor. (1) (c) The new speed of the motor in r/min. (2) If the current is 45 A and the shunt field is reduced to 75% of its normal value by increasing resistance in the field circuit, determine the following: (d) The new kΦ2 of the motor. (2) (e) The new speed of the motor in r/min. (2)