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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