Electrical Engineering MCQs

Page No. 293

The armature torque of the D.C. shunt motor is proportional to____________?


afield flux only


barmature current only


cboth A. and B.


dnone of the above


View Answer armature current only

As -the load is increased the speed of D.C. shunt motor will____________?


areduce slightly


bincrease slightly


c increase proportionately


d remains unchanged


View Answer reduce slightly

Which of the following motor has the poorest speed regulation ?


aShunt motor


bSeries motor


cDifferential compound motor


dCumulative compound motor


View Answer Series motor

Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of_____________?


aD.C. series motor


bD.C. shunt motor


cinduction motor


dall of above motors


View Answer D.C. series motor

In a differentially compounded D.C. motor, if shunt field suddenly opens____________?


athe motor will first stop and then run in opposite direction as series motor


bthe motor will work as series motor and run at slow speed in the same direction


cthe motor will work as series motor and run at high speed in the same direction


dthe motor will not work and come to stop



Following motor is used where high starting torque and wide speed range control is required?


aSingle phase capacitor start


bInduction motor


cSynchronous motor


dD.C. motor


View Answer D.C. motor

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be_____________?


a level compounded


b under compounded


ccumulatively compounded


ddifferentially compounded



Speed control by Ward Leonard method gives uniform speed variation_____________?


ain one direction


b in both directions


cbelow normal speed only


dabove normal speed only


View Answer in both directions

Sparking, is discouraged in a D.C. motor because_____________?


a it increases the input power con-sumption


bcommutator gets damaged


cboth A. and B.


dnone of the above



Three point starter can be used for______________?


aseries motor only


bshunt motor only


c compound motor only


dboth shunt and compound motor



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