D.C. Generators Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “D.C. Generators Mcqs”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate D.C. Generators Mcqs comprehensively.

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16.
The commutator segments are connected to the armature conductors by means of___________?

Copper lugs

Resistance wires

Insulation pads

Brazing

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17.
Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?

0.005 mm

0.05 mm

0.5 m

5 m

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18.
Laminations of core are generally made of________________?

Case iron

Carbon

Silicon steel

Stainless steel

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19.
The armature of D.C. generator is laminated to_______________?

Reduce the bulk

Provide the bulk

Insulate the core

Reduce eddy current loss

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20.
Iron losses in a D.C. machine are independent of variations in_____________?

Speed

Load

Voltage

Speed and voltage

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21.
Iron losses in a D.C. machine are independent of variations in______________?

Speed

Load

Voltage

Speed and voltage

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22.
In D.C. generators, current to the external circuit from armature is given through_____________?

Commutator

Solid connection

Slip rings

None of above

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24.
If a D.C. generator fails to build up the probable cause could not be_____________?

Imperfect brush contact

Field resistance less than the critical resistance

No residual magnetism in the generator

Faulty shunt connections tending to reduce the residual magnetism

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25.
If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by______________?

Blv

Blv2

Bl2v

Bl2v2

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26.
In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?

4

8

16

32

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28.
The insulating material used between the commutator segments is normally_____________?

Graphite

Paper

Mica

Insulating varnish

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29.
In D.C. generators, the brushes on commutator remain in contact with conductors which_________________?

Lie under south pole

Lie under north pole

Lie under interpolar region

Are farthest from the poles

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30.
If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be________________?

Demagnetisation only

Cross magnetisation as well as mag¬netisation

Crossmagnetisation as well as demagnetising

Cross magnetisation only

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