Electrical Engineering MCQs

Page No. 286

In D.C. generators, the cause of rapid brush wear may be___________?


asevere sparking


b rough commutator surface


c imperfect contact


dany of the above


View Answer any of the above

The bearings used to support the rotor shafts are generally______________?


a ball bearings


b bush bearings


cmagnetic bearmgs


dneedle bearings


View Answer ball bearings

In lap winding, the number of brushes is always_____________?


adouble the number of poles


b same as the number of poles


c half the number of poles


d two



In a four-pole D.C. machine____________?


aall the four poles are north poles


balternate poles are north and south


call the four poles are south poles


d two north poles follow two south poles



A separately excited generator as compared to a self-excited generator_____________?


ais amenable to better voltage control


b is more stable


chas exciting current independent of load current


d has all above features



Ward Leonard method of speed control is basically a______________?


a field control method


barmature controlled method


cfield diverter


d frequency control method



Which of the following test can be performed on DC series motor?


a Swinburne test


b Hopkinson test


cBrake test


dField test


View Answer Field test

Armature reaction in dc motor results___________?


adecrease in speed


b increase in speed


c short circuit


dopen circuit


View Answer increase in speed

In a DC motor the inter-pole winding is connected in________________?


aseries with field winding


b series speed armature winding


cparallel big field winding


dparallel with armature winding



A dc series motor should not be started on no load because it would___________?


anot develop starting torque


bil to start without load


crun at dangerously high speed


ddraw more current without producing sufficient torque



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