Discussion
The magnetising branch of the equivalent circuit carries
Answer: B
Correct answer: the current that establishes the air gap flux and supplies the core loss
The shunt branch of the equivalent circuit carries the magnetising current, largely reactive, which sets up the air gap flux, together with the small in-phase component representing hysteresis and eddy current loss in the iron. It is drawn whether or not the machine is loaded, which is why an induction machine has a poor power factor at light load.
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