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Electrician Set-1
Polyphase Induction Motors
2

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

2) The no. of poles of a 3-phase induction motor running at 500 R.P.M. will be : (supply frequency = 50 Hz)

12

76

4

2

Answer is:

12

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

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

3) The starting torque of a 3-phase induction motor can be increased :

by increasing the rotor resistance

by increasing the stator resistance

by increasing the air-gap between the stator and the rotor

none of these

Answer is:

by increasing the rotor resistance

4) At the time of starting, the slip of an induction-motor is equal to :

infinite

unit

zero

none of these

Answer is:

unit

5) The reason of drawing high current at the time of starting by an induction-motor is :

high voltage

low power factor

zero back e.m.f.

none of these

Answer is:

zero back e.m.f.

6) For the speed control purpose, pole changing method can be adopted for a :

slip-ring motor

synchronous motor

squirrel-cage induction-motor

single-phase motor

Answer is:

squirrel-cage induction-motor

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

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