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Electrician
Electrician Set-1
Polyphase Induction Motors
30

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

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

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

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

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

overload

over voltage

excess current

short-circuit

Answer is:

short-circuit

32) A 4-pole, 3-phase, 50 Hz motor's speed is 95% of its synchronous speed then the actual speed of the motor is :

500 r.p.m.

1300 r.p.m.

1400 r.p.m.

1425 r.p.m.

Answer is:

1425 r.p.m.

33) The induction motor of a pump is run at a supply voltage 30% lesser than the normal voltage (415 V). The pump starts to work. After some time what possibly can happen ?

The motor will become hot and will be damaged

The motor will start after some time

The motor will function normally

None of the stated above will happen

Answer is:

The motor will become hot and will be damaged

34) The purpose of adding a rheostat to slip-ring induction motor is to :

limit the starting increase

increase the starting current

decrease the starting current so that the starting torque may increase

none of the stated above

Answer is:

decrease the starting current so that the starting torque may increase

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

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