In case if a dc machine, the value of load current at maximum efficien – McqOptions

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1.	In case if a dc machine, the value of load current at maximum efficiency is:
A.	IL = √(constant losses / armature resistance)
B.	IL = √(variable losses / armature resistance)
C.	IL = √(variable loss + constant losses / armature resistance)
D.	IL = √(constant losses / Ra + Rf)
Answer» B. IL = √(variable losses / armature resistance)

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