Electrical Engineering MCQs

Page No. 292

The armature voltage control of D.C. motor provides_____________?


aconstant voltage drive


bconstant current drive


cconstant torque drive


dnone of the above


View Answer constant torque drive

The plugging gives the____________?


azero torque braking


bsmallest torque braking


chighest torque braking


dnone of the above



For a D.C. shunt motor if the excitation is changed_______________?


a torque will remain constant


btorque will change but power will remain constant


c torque and power both will change


dtorque, power and speed, all will change



Which motor has the poorest speed control?


aDifferentially compounded motor


bCumulatively compounded motor


cShunt motor


dSeries motor


View Answer Series motor

If I2 be the armature current, then speed of a D.C. shunt motor is_______________?


a independent of Ia


bproportional to la


cvaries as (Ia)


dvaries as la


View Answer independent of Ia

The speed of a D.C. shunt motor can be increased by_______________?


aincreasing the resistance in armature circuit


bincreasing the resistance in field circuit


c reducing the resistance in the field circuit


d reducing the resistance in the armature circuit



As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit____________________?


aa resistance is connected in series with armature


b a resistance is connected parallel to the armature


carmature is temporarily open circuited


da high value resistor is connected across the field winding



The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is______________?


a2.36%


b4.76%


c6.77%


d8.84%


View Answer 4.76%

Usually wide and sensitive speed control is desired in case of____________?


acentrifugal pumps


belevators


csteel rolling mills


dcolliery winders


View Answer colliery winders

Which of the following method of speed control of D.C. machine will offer minimum efficiency ?


aVoltage control method


bField control method


cArmature control method


dAll above methods



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