AC 3 PHASE INDUCTION MOTOR - Practice Mode

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

Holding coil Back up fuse Thermal relay Push button switch

Correct Answer: Thermal relay

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

6 4 5 3

Correct Answer: 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

Correct Answer: Timer

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

Correct Answer: Root 3 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

Correct Answer: Normally closed push button

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