Electrical Engineering MCQs

Page No. 286

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


asevere sparking

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b rough commutator surface

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c imperfect contact

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dany of the above

✓


View Answer any of the above

The bearings used to support the rotor shafts are generally______________?


a ball bearings

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b bush bearings

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cmagnetic bearmgs

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dneedle bearings

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View Answer ball bearings

In lap winding, the number of brushes is always_____________?


adouble the number of poles

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b same as the number of poles

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c half the number of poles

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d two

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In a four-pole D.C. machine____________?


aall the four poles are north poles

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balternate poles are north and south

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call the four poles are south poles

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d two north poles follow two south poles

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


ais amenable to better voltage control

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b is more stable

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chas exciting current independent of load current

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d has all above features

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Ward Leonard method of speed control is basically a______________?


a field control method

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barmature controlled method

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cfield diverter

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d frequency control method

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


a Swinburne test

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b Hopkinson test

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cBrake test

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dField test

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View Answer Field test

Armature reaction in dc motor results___________?


adecrease in speed

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b increase in speed

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c short circuit

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dopen circuit

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View Answer increase in speed

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


aseries with field winding

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b series speed armature winding

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cparallel big field winding

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dparallel with armature winding

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


anot develop starting torque

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bil to start without load

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crun at dangerously high speed

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ddraw more current without producing sufficient torque

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