Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part2 : 21 to 25
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
21.Slip of an induction motor is negative when |
| magnetic field and rotor rotate in opposite direction |
| rotor speed is less than the syn-chronous speed of the field and are in the same direction |
| rotor speed is more than the syn-chronous speed of the field and are in the same direction |
| none of the above |
22.In three-phase squirrel-cage induction motors |
| rotor conductor ends are short-circuited through slip rings |
| rotor conductors are short-circuited through end rings |
| rotor conductors are kept open |
| rotor conductors are connected to insulation |
23.If any two phases for an induction motor are interchanged |
| the motor will run in reverse direction |
| the motor will run at reduced speed |
| the motor will not run |
| the motor will burn |
24.DOL starting of induction motors is usually restricted to |
| low horsepower motors |
| variable speed motors |
| high horsepower motors |
| high speed motors |
More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages
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