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Electrician Set-1
Polyphase Induction Motors
16

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

16) In a 3-phase induction-motor started by a D.O.L. starter, protection against short-circuit is given by the :

overload relay

no-volt coil

back-up fuses

protective earth contractor

Answer is:

back-up fuses

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

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

17) When a squirrel cage induction-motor is started directly by a D.O.L. starter, the starting current will be :

equal to the full-load current

twice the full-load current

3 times the full-load current

5 to 7 times the full-load current

Answer is:

5 to 7 times the full-load current

18) Total electrical degrees for a 4 pole (ac) machine is equal to :

180 degree

360 degree

720 degree

1080 degree

Answer is:

720 degree

19) A 3-phase, 400 V, 50 Hz induction motor has a rated speed of 715 r.p.m. How many poles are there in the machine ?

2

4

6

8

Answer is:

8

20) The starting torque of a squirrel cage induction motor is low because of :

low starting current, low starting P.F.

low starting current, high starting P.F.

high starting current, high starting P.F.

high starting current, low starting PF.

Answer is:

high starting current, high starting P.F.

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

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