Polyphase Induction Motors QUESTIONS AND ANSWERS

Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part2 : 11 to 15

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

11.The power factor of an induction motor under no-load conditions will be closer to

0.2 lagging

0.2 leading

0.5 leading

unity

12.If an induction motor with certain ratio of rotor to stator slots, runs at 1/7 of the normal speed, the phenomenon will be termed as

humming

hunting

crawling

cogging

13.The speed of a squirrel-cage induction motor can be controlled by all of the following except

changing supply frequency

changing number of poles

changing winding resistance

reducing supply voltage

14.A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor

will continue running burning its one phase

will continue running burning its two phases

will stop and carry heavy current causing permanent damage to its winding

will continue running without any harm to the winding

15.For which motor the speed can be controlled from rotor side ?

Squirrel-cage induction motor

Slip-ring induction motor

Both (a) and (b)

None of the above

More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages

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

Polyphase Induction Motors QUESTIONS AND ANSWERS

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