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

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bHopkinson’s test

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c Field test

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dBrake test

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View Answer Field test

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


astray losses

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beddy current losses

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cfield copper losses

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dwindage losses

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View Answer stray losses

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


a iron losses

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bline losses

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c sparking

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dcorona losses

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View Answer line losses

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


ayoke

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b commutator

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carmature conductors

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darmature rotor

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View Answer armature rotor

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


a full-load

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brated r.p.m.

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crated voltage

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dall of the above

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View Answer full-load

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


aeddy current losses = stray losses

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bhysteresis losses = eddy current losses

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ccopper losses = 0

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dvariable losses = constant losses

✓



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


a100 W

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b500 W

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c1000 W

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d1500 W

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View Answer 500 W

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


aHysteresis losses

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bEddy current losses

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cCopper losses

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dWindage losses

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View Answer Eddy current losses

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


aMechanical loss

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bCore loss

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cCopper loss

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dAll of the above

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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

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bProviding laminations in stator

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cUsing non-magnetic material for frame

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

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