engineering recuitment UPCL AE (E&M) 2021 Mock Test Electrical Machines Three Phase Induction Motor

In an electric drive using a three-phase induction motor, it is intended to apply regenerative braking. This is possible only if:

1
The rotor speed is greater than the speed of the magnetic field produced by stator currents, both rotating in the same direction.
2
The rotor speed is equal to the speed of the magnetic field produced by stator currents, both rotating in the same direction.
3
The rotor speed is greater than the speed of the magnetic field produced by stator currents, both rotating in opposite directions.
4
The rotor speed is less than the speed of the magnetic field produced by stator currents, both rotating in the same direction.
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