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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