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

Electrical Engineering : Polyphase Induction Motors QUESTIONS AND ANSWERS :: part2 : 16 to 20

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

16.When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered

in series
in parallel
in series-parallel
in parallel with stator

17.Slip ring motor is recommended where

speed control is required
frequent starting, stopping and reversing is required
high starting torque is needed
all above features are required

18.The 'crawling" in an induction motor is caused by

high loads
low voltage supply
improper design of machine
harmonics developed in the motor

19.It is advisable to avoid line-starting of induction motor and use starter because

motor takes five to seven times its full load current
it will pick-up very high speed and may go out of step
it will run in reverse direction
starting torque is very high

20.Low voltage at motor terminals is due to

inadequate motor wiring
poorely regulated power supply
any one of the above
none of the above

More Polyphase Induction Motors QUESTIONS AND ANSWERS available in next pages

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