780 V, 97 A, 1360 rpm separately excited dc motor with armature resistance (Ra) equal to 9 ohms. Calculate back emf developed in the motor when it operates on one-fourth of the full load. (Assume rotational losses are neglected)

780 V, 97 A, 1360 rpm separately excited dc motor with armature resist

1.	780 V, 97 A, 1360 rpm separately excited dc motor with armature resistance (Ra) equal to 9 ohms. Calculate back emf developed in the motor when it operates on one-fourth of the full load. (Assume rotational losses are neglected)
A.	564.75 V
B.	561.75 V
C.	562.45 V
D.	565.12 V
Answer» C.