Q9-c) A 3-phase induction motor used to drive the compressor of a building airconditioning system having the following information; Starting circuit Star/Delta Voltage/Frequency 400 V / 50 Hz No. of...

Q9-c) A 3-phase induction motor used to drive the compressor of a building airconditioning system having the following information;

Starting circuit Star/Delta
Voltage/Frequency 400 V / 50 Hz
No. of pole 4
Rotor speed 1480 rpm
Rating power 20 HP
Power factor 0.7

Calculate;

i. Synchronous speed and slip in percentage

ii. Current taken by the motor if operated at rating power