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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