A 6-pole, 500-V. wave-connected shunt motor has 1200 armature conductors and useful flux/pole of 20 mWb. The armature and field resistances are 0.5 Q and 250 O respectively. What will be the speed and...

A 6-pole, 500-V. wave-connected shunt motor has 1200 armature conductors and useful flux/pole of 20 mWb. The armature and field resistances are 0.5 Ω and 250 Ω respectively. What will be the speed and torque developed by the motor when it draws 20 A. from the supply mains? If the magnetic and mechanical losses amount to 900 W., find (a) useful torque, (b) output in kW, and (c) efficiency at this load.

Extracted text: A 6-pole, 500-V. wave-connected shunt motor has 1200 armature conductors and useful flux/pole of 20 mWb. The armature and field resistances are 0.5 Q and 250 O respectively. What will be the speed and torque developed by the motor when it draws 20 A. from the supply mains? If the magnetic and mechanical losses amount to 900 W., find (a) useful torque, (b) output in kW, and (c) efficiency at this load.