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Electrician
Electrician Set-1
Polyphase Induction Motors
27

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

27) NVC used in a starter is meant to protect the motor against :

short-circuit

open-circuit

excess current

low voltage

Answer is:

low voltage

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

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Related Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

28) No-load current of an induction motor is approximately _____ percent of full-load current.

10

20

40

75

Answer is:

40

29) In a D.O.L. starter a NVC is connected across a phase and neutral of a 3-phase, 415 V, 50 Hz supply and it works normally. What is the rating of NVC ?

220 V

230 V

400 V

415 V

Answer is:

230 V

30) A D.O.L. starter can be used satisfactorily for a double cage squirrel cage induction motor up to :

1 kW

1.5 kW

3 kW

5 kW

Answer is:

1.5 kW

31) The purpose of a back-up fuse is to provide protection against :

overload

over voltage

excess current

short-circuit

Answer is:

short-circuit

Polyphase Induction Motors MCQ - Electrician (Set-1) with Answers

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