100 V, 2 A, 90 rpm separately excited dc motor with armature resistanc – McqOptions

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1.	100 V, 2 A, 90 rpm separately excited dc motor with armature resistance (R_a) equal to 8 ohms. Calculate back emf developed in the motor when it operates on 3^th/4 of the full load. (Assume rotational losses are neglected)
A.	100 V
B.	87 V
C.	88 V
D.	90 V
Answer» D. 90 V

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