How does the current appears in rotor of squirrel cage induction motor?Question 6Select one:a.From external power supplyb.By inductionc.Through slip rings

Analysis of the Question

The question pertains to the operation of a squirrel cage induction motor and how current is induced in the rotor.

1. Understanding the Squirrel Cage Induction Motor:

   • The squirrel cage induction motor operates on the principle of electromagnetic induction.
   • The rotor is constructed from conductive bars shorted at both ends, resembling a cage.

2. Current Induction Mechanism:

   • The stator windings create a rotating magnetic field when alternating current is supplied.
   • This rotating magnetic field induces a current in the rotor bars.

3. Options Examination:

   • a. From external power supply: This option is incorrect because the rotor does not receive power directly from an external source.
   • b. By induction: This option is correct as the rotor current is induced due to the changing magnetic field.
   • c. Through slip rings: This option is incorrect since squirrel cage rotors do not use slip rings, unlike wound rotors.

Conclusion

The current appears in the rotor of a squirrel cage induction motor primarily by induction from the stator's rotating magnetic field.

Final Answer

b. By induction