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Wireman Set-1
AC 3 Phase Induction motor
16

AC 3 Phase Induction motor MCQ with Answers

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

Holding coil

Back up fuse

Thermal relay

Push button switch

Answer is:

Thermal relay

AC 3 Phase Induction motor MCQ with Answers

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Related AC 3 Phase Induction motor MCQ with Answers

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

6

4

5

3

Answer is:

3

18) 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

Answer is:

Timer

19) 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

Answer is:

Root 3 Times

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

OLR

Star contactor

Delta contactor

Normally closed push button

Answer is:

Normally closed push button

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