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

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

36) When the rotor of a slip-ring induction motor is standstill, the rotor frequency is :

Answer is:

equal to the stator frequency

37) If the load on a motor is increased beyond its full-load point, the greatest effect of the increase in slip is in :

Answer is:

increasing the current

38) Regarding skewing of motor bars in a squirrel cage induction motor (SCIM), which statement is false ?

Answer is:

it increases starting torque

39) The principle of operation of a 3-phase induction motor is similar to that of a

Answer is:

transformer with a shorted secondary

40) The effect of increasing the length of air gap in an induction motor will be to increase the

Answer is:

magnetising current

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