A three phase motor is used to drive a pump. When connected to a 60 Hz utility system it is observed that the motor speed decreases to 1795 RPM with no mechanical load on the pump. When the mechanical load is added to the pump the speed changes to 1745 RPM.
(a) 15pts. State what type of machine (synchronous or asynchronous) is this machine. Justify your answer.
(b) 10pts. State the number of poles this machine has. Justify your answer.