31) Which speed control method of 3 f motor is used only induction motor supplied by generator?

Casecade operation method

By changing the number of stator poles

By injection Emf in rotor circuit

By changing the supplied voltage

Answer is:

By changing the number of stator poles

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:

Voltage control

Cascade operation

Pole changing control

Supply frequency control

Answer is: