Electrical Engineering Questions And Answers :: Single Phase Induction Motors: part1

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Electrical Engineering : Single Phase Induction Motors QUESTIONS AND ANSWERS :: part1 : 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.In a shaded pole motor, the shading coil usually consist of

a single turn of heavy wire which is in parallel with running winding
a single turn of heavy copper wire which is short-circuited and carries only induced current
a multilayer fine gauge copper wire in parallel with running winding
none of the above

22.The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be

at the end connections
at the end terminals
anywhere on the winding inside a slot
at the slot edge where coil enters or comes out of the slot

23.A centrifugal switch is used to dis- connect 'starting winding when motor has

run for about 1 minute
run for about 5 minutes
picked up about 50 to 70 per cent of rated speed
picked up about 10 to 25 per cent of rated speed

24.In a capacitor start motor, the phase displacement between starting and running winding can be nearly

10�
30�
60�
90�

25.In a capacitor start single-phase motor, when capacitor is replaced by a resistance

torque will increase
the motor will consume less power
motor will run in reverse direction
motor will continue to run in same direction

More Single Phase Induction Motors QUESTIONS AND ANSWERS available in next pages

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