Question: 100 V, 2 A, 90 rpm separately excited dc motor with armature resistance (Ra) equal to 8 ohms. Calculate back emf developed in the motor when it operates on 3th/4 of the full load. (Assume rotational losses are neglected)
Options
A : 100 V
B : 87 V
C : 88 V
D : 90 V
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