Electrical Engineering Questions And Answers :: Polyphase Induction Motors: part2



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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