SOLUTION

• Since in the case of the centrifugal pump the most preferred motor is the squirrel cage induction motor.
• In case of centrifugal pumps, the starting torque is generally Less than running torque.
• In case of centrifugal pumps, starting torque can be taken as approximately 55% of full load torque.
• In the squirrel cage induction motor, the starting current is high, and these motors exhibit good running torque.
• Motors containing rotors of this type generally have very good speed regulation and low percent slip.
• It should be noted that although motors with rotors that fall into this range exhibit poor starting torque per ampere of starting current, the starting torque is still slightly greater than the amount of running torque.
• These motors do not generally exhibit difficulty starting unless the load requires some time to reach normal speed.
• The extended time will cause the high starting current to overheat the windings.