The advantage of slipring induction motor over the squirrel cage induction motor is

• A. It's power factor is higher
• B. It has a higher efficiency
• C. It is suitable for higher speeds
• D. It can be started with the help of rotor resistances

Answer: (D)

slip ring motor have high starting torque compare to squirrel cage motor and have good speed control
also have high over loading capacity, smooth acceleration under heavy loads.