Electrical Engineering MCQs

Page No. 263

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__________


aat the end connectio

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bat the end terminals

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canywhere on the winding inside a slot

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dat the slot edge where coil enters or comes out of the slot

✓



The value of starting capacitor of a fractional horse power motor will be__________?


a 100 uF

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b 200 uF

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c 300 uF

✓


d400 uF

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View Answer 300 uF

In repulsion motor direction of rotation of motor____________?


ais opposite to that of brush shift

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bis the same as that of brush shift

✓


cis independent of brush shift

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dNone of these

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A centrifugal switch is used to dis- connect ‘starting winding when motor has___________?


arun for about 1 minute

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b run for about 5 minutes

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cpicked up about 50 to 70 per cent of rated speed

✓


d picked up about 10 to 25 per cent of rated speed

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In a shaded pole single-phase motor, the revolving field is produced by the use of_________?


a inductor

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bcapacitor

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cresistor

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dshading coils

✓


View Answer shading coils

If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?


aUniversal motor

✓


bShaded pole type motor

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c Capacitor start motor

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dCapacitor start and run motor

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View Answer Universal motor

Which of the following motor will have relatively higher power factor ?


a Capacitor run motor

✓


bShaded pole motor

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cCapacitor start motor

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d Split phase motor

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In a shaded pole motor, the shading coil usually consist of___________?


a a single turn of heavy wire which is in parallel with running winding

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ba single turn of heavy copper wire which is short-circuited and carries only induced current

✓


ca multilayer fine gauge copper wire in parallel with running winding

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dnone of the above

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The rotor developed by a single-phase motor at starting is___________?


a more than i.he rated torque

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brated torque

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cless than the rated torque

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dzero

✓


View Answer zero

In a split phase motor____________?


athe starting winding is connected through a centrifugal switch

✓


bthe running winding is connected through a centrifugal switch

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cboth starting and running windings are connected through a centrifugal switch

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d centrifugal switch is used to control supply voltage

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