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A 3-phase startor and rotor winding of a slip-ring induction motor is fed by 3-phase ac supply at a fr equency f. If the rotor speed i s Nr and synchronous speed is Ns then, the absolute speed of resultant flux in space is
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- Ns irrespective of rotor speed Nr
- (Ns + Nr) if t he flux rot at es in the same direction as the rotor
- (Ns – Nr) if the flux rot at es in the same direction as the rotor
- Nr, irrespective of Ns
Correct Option: A
NA
