Electrical Engineering MCQs

Page No. 290

In a manual shunt motor starter?


aover load relay is connected in series and no volt relay in parallel with the load


bover load relay is connected in parallel and no volt relay in series with the load


c over load relay and no volt relay are both connected in series with the load


dover load relay and no volt relay are both connected in parallel with the load



D.C. shunt motors are used for driving____________?


atrains


bcranes


choists


dmachine tools


View Answer machine tools

Torque developed by a D.C. motor depends upon_____________?


amagnetic field


bactive length of the conductor


ccurrent flow through the conductors


dall above factors


View Answer all above factors

Which of the following loss in a D.C. generator varies significantly with the load current ?


aField copper loss


bWindage loss


c Armature copper loss


dNone of the above



The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?


ahysteresis loss


bfield copper loss


carmature copper loss


d eddy current loss


View Answer armature copper loss

In a D.C. generator all of the following could be the effects of iron losses except___________?


aLoss of efficiency


b Excessive heating of core


c Increase in terminal voltage


d Rise in temperature of ventilating air



The hysteresis loss in a D.C. machine least depends on____________?


aFrequency of magnetic reversals


bMaximum value of flux density


cVolume and grade of iron


dRate of flow of ventilating air



Regenerative method of braking is based on that___________?


aback e.m.f. is less than the applied voltage


bback e.m.f. is equal to the applied voltage


cback e.m.f. of rotor is more than the applied voltage


dnone of the above



The main disadvantage of the Ward-Leonard control method is______________?


ahigh initial cost


bhigh maintenance cost


clow efficiency at Hght loads


dall of the above


View Answer all of the above

In Ward-Leonard control the lower limit of speed is imposed by________?


aresidual magnetism of the generator


bcore losses of motor


cmechanical losses of motor and generator together


dall of the above



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