30) Which method is used to control the speed of 3 phase induction motor from stator side?

By cascade operation

By rotor rheostat control

By injecting emf in rotor circuit

By changing the applied frequency

Answer is:

By changing the applied frequency

Casecade operation method

By changing the number of stator poles

By injection Emf in rotor circuit

By changing the supplied voltage

Answer is:

Casecade operation method

Rotor rheostat speed control

Changing the applied frequency method

Changing the number of stator poles method

Answer is:

By rotor rheostat control

By changing applied voltage

By injecting EMF in rotor circuit

By changing the number of stator poles

Answer is:

By cascade operation

By changing the applied voltage

By changing the supply frequency

By changing the number of stator poles

Answer is: