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

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

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

Answer is:

squirrel-cage induction-motor

7) The principle of operation of an induction-motor is based on :

Answer is:

Rotating magnetic field

8) The speed of rotor of an induction-motor is :

Answer is:

lesser than the synchronous speed

9) To reverse the direction of rotation of a 3-phase induction-motor, it is necessary to :

Answer is:

interchange any two out of the three line connections

10) Squirrel-cage induction-motor differs from a slip-ring induction-motor as it has no :

Answer is:

slip-rings