Electrical Machines DC Generators Generator EMF Equation

A 220 V separately excited dc motor takes 20 A and the armature resistance is 1.0 Ω. If the armature constant KaΦ = 1.5 Volt-sec/ rad, the speed of the motor is

1
1000 rpm
2
2000/π  rpm
3
3000/π  rpm
4
4000/π rpm
5
4000 rpm
5
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