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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