AC THREE PHASE MOTOR - Quiz

1) Which is the cause for the 3 phase motor starter with single phase preventer trips frequently?

Incorrect fuse ratings Unbalanced line voltage Incorrect settings of OLR Improper phase sequence

2) What indication denotes the shorted coil defect in 3 phase motor stator winding while testing with internal growler by keeping hacksaw blade?

Hacksaw blade gets over heated Rapid vibration of hacksaw blade Hacksaw blade repels against the slots Attracted by the winding turns on the slot