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During no-load test, an induction motor draws power
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- for core loss and windage and friction loss
- for core loss and copper loss
- for copper loss and windage and friction loss
- only for the very small copper loss.
Correct Option: B
For a synchronous machine with cylindrical rot or, magnetic circuit air -gap, and hence permeance, is same at every point. Whatever may be the rotor position, permeance seen by the rotor winding, or a winding on the startor remains constant and does not change with rotor position. Thus startor winding inductance L1, and rotor winding inductance L2 do not vary with respect to the rotor position angle θ.
