Electrical Engineering MCQs

Page No. 289

Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity ?


aSwinburne’s test


bHopkinson’s test


c Field test


dBrake test


View Answer Field test

The purpose of retardation test on D.C. shunt machines is to find out____________?


astray losses


beddy current losses


cfield copper losses


dwindage losses


View Answer stray losses

D.C. generators are installed near the load centres to reduce_____________?


a iron losses


bline losses


c sparking


dcorona losses


View Answer line losses

In a D.C. generator, the iron losses mainly take place in___________/


ayoke


b commutator


carmature conductors


darmature rotor


View Answer armature rotor

D.C. generators are normally designed for maximum efficiency around_____________?


a full-load


brated r.p.m.


crated voltage


dall of the above


View Answer full-load

The condition for maximum efficiency for a D.C. generator is______________?


aeddy current losses = stray losses


bhysteresis losses = eddy current losses


ccopper losses = 0


dvariable losses = constant losses



The total losses in a well designed D.C. generator of 10 kW will be nearly______________?


a100 W


b500 W


c1000 W


d1500 W


View Answer 500 W

Which of the following losses are significantly reduced by laminating the core of a D.C. generator ?


aHysteresis losses


bEddy current losses


cCopper losses


dWindage losses


View Answer Eddy current losses

Which of the following loss in a D.C. generator is dissipated in the form of heat?


aMechanical loss


bCore loss


cCopper loss


dAll of the above


View Answer All of the above

Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?


aProviding laminations in armature core


bProviding laminations in stator


cUsing non-magnetic material for frame


d Using material of low hysteresis co-efficient for armature core material



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