Three Phase Induction Motors
The injected e.m.f. in the rotor of induction motor must have

The same phase as the rotor e.m.f.
Zero frequency
The same frequency as the slip frequency
High value for the satisfactory speed control

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Three Phase Induction Motors
Slip of an induction motor is negative when

None of these
Rotor speed is more than the synchronous speed of the field and are in the same direction
Magnetic field and rotor rotate in opposite direction
Rotor speed is less than the synchronous speed of the field and are in the same direction

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