Which statement is true about the squirrel cage rotor?

The statement that the squirrel cage rotor is commonly used in induction motors is indeed correct. Squirrel cage rotors are a fundamental component in most industrial and commercial induction motors due to their simple construction, robustness, and reliability. This design features conductive bars short-circuited at both ends by end rings, which provides excellent performance characteristics for the rotor in transforming electrical energy into mechanical energy through electromagnetic induction.

The squirrel cage rotor allows for smooth operation at various speeds and typically requires minimal maintenance, making it ideal for many applications. Because the rotor is not connected to any external circuit, it does not require brush maintenance, which further enhances the durability and longevity of the motor in a wide range of environments. Its efficiency and effectiveness in handling heavy loads at stable speeds have made it the preferred choice for most induction motors used today.