Electrical Engineering MCQs

Page No. 283

Welding generator will have____________?


alap winding


b wave winding


cdelta winding


dduplex wave winding


View Answer lap winding

Equilizer rings are required in case armature is_______________?


a wave wound


b lap wound


cdelta wound


dduplex wound


View Answer lap wound

Eddy currents are induced in the pole shoes of a D.C. machine due to______________?


aoscillating magnetic field


b pulsating magnetic flux


crelative rotation between field and armature


dall above



D.C. generators are connected to the busbars or disconnected from them only under the floating condition________________?


ato avoid sudden loading of the primemover


b to avoid mechanicaljerk to the shaft


cto avoid burning of switch contacts


dall above


View Answer all above

Armature reaction of an unsaturated D.C. machine is_____________?


acrossmagnetising


bdemagnetising


cmagnetising


dnone of above


View Answer crossmagnetising

If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?


a demagnetisation only


bcross magnetisation as well as mag¬netisation


ccrossmagnetisation as well as demagnetising


dcross magnetisation only



In D.C. generators, the brushes on commutator remain in contact with conductors which_________________?


alie under south pole


b lie under north pole


c lie under interpolar region


d are farthest from the poles



The insulating material used between the commutator segments is normally_____________?


agraphite


bpaper


cmica


dinsulating varnish


View Answer mica

The material for commutator brushes is generally_______________?


amica


bcopper


ccast iron


dcarbon


View Answer carbon

In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?


a4


b8


c 16


d32


View Answer 8

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