Electrical Engineering MCQs

Page No. 298

For starting a D.C. motor a starter is required because___________?


ait limits the speed of the motor


b it limits the starting current to a safe value


cit starts the motor


d none of the above



A D.C. series motor is that which______________?


ahas its field winding consisting of thick wire and less turns


bhas a poor torque


ccan be started easily without load


dhas almost constant speed



In D.C. shunt motors as load is reduced__________________?


athe speed will increase abruptly


b the speed will increase in proportion to reduction in load


cthe speed will remain almost/constant


d the speed will reduce



Starters are used with D.C. motors because______________?


athese motors have high starting torque


b these motors are not self-starting


cback e.m.f. of these motors is zero initially


dto restrict armature current as there is no back e.m.f. while starting



If the field of a D.C. shunt motor gets opened while motor is running______________?


athe speed of motor will be reduced %


bthe armature current will reduce


c the motor will attain dangerously high speed 1


dthe motor will continue to nuvat constant speed



According to Fleming’s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of_________________?


a current in the conductor aovtaat of conductor


bresultant force on conductor


cnone of the above


dA&C



Which D.C. motor is preferred for elevators ?


aShunt motor


bSeries motor


cDifferential compound motor


d Cumulative compound motor



Differentially compound D.C. motors can find applications requiring___________?


ahigh starting torque


blow starting torque


c variable speed


dfrequent on-off cycles


View Answer low starting torque

Which D.C. motor will be preferred for machine tools ?


a Series motor


bShunt motor


cCumulative compound motor


dDifferential compound motor


View Answer Shunt motor

If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?


aSeries motor


bShunt motor


cDifferentially compound motor


dCumulative compound motor


View Answer Series motor

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