AC 3 PHASE INDUCTION MOTOR - Quiz

1) Which device in DOL starter provides effective protection against over load?

Holding coil Back up fuse Thermal relay Push button switch

2) How many number of contactors are used in a semi automatic star delta starter?

6 4 5 3

3) Which is the additional device used in automatic star delta starter than semi automatic star delta starter?

Push button station Timer OLR Number of contacts

4) How many times of starting current in 3f induction motor is reduced, while starting by star delta starter?

3 times 1/3 times Root 3 Times 1/2 Times

5) Which device is used in control of a star delta starter to stop the motor?

OLR Star contactor Delta contactor Normally closed push button