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


bat the end terminals


canywhere on the winding inside a slot


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


b 200 uF


c 300 uF


d400 uF


View Answer 300 uF

In repulsion motor direction of rotation of motor____________?


ais opposite to that of brush shift


bis the same as that of brush shift


cis independent of brush shift


dNone of these



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


arun for about 1 minute


b run for about 5 minutes


cpicked up about 50 to 70 per cent of rated speed


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



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


a inductor


bcapacitor


cresistor


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


c Capacitor start motor


dCapacitor start and run motor


View Answer Universal motor

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


a Capacitor run motor


bShaded pole motor


cCapacitor start motor


d Split phase motor



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


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


dnone of the above



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


a more than i.he rated torque


brated torque


cless than the rated torque


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


cboth starting and running windings are connected through a centrifugal switch


d centrifugal switch is used to control supply voltage



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