DATA TYPES AND VARIABLES QUIZ

The number of brushes in a commutator depends on

Type of winding

Voltage

Speed of armature

Amount of current to be collected

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Dc machines which are subjected to abrupt changes of load are provided with

Equalisers

Interpole windings

Copper brushes

Compensating windings

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YOUR ANSWER : ?

In a dc generator, the eddy current power loss is

None of the listed here

Directly proportional to thickness of each lamination

Directly proportional to sqaure of thickness of each lamination

Inversely proprtional to thickness of each lamination

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YOUR ANSWER : ?

The main factor which leads to unstable parallel operation of flat and over compounded generators is

unequal speed regulation of their primemovers

unequal number of turns in their series field windings

their rising voltage characteristics

unequal series field resistances

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YOUR ANSWER : ?

In lap winding, the number of brushes is always

Same as the number of poles

Half the number of poles

Two

Double the number of poles

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The physical size of 100 kW, 2000 rpm generator is _____ that of 10 kW, 200 rpm generator.

About the same as

None of the listed here

Less than

More than

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Which of the following will not prevent a self excited shunt generator from building upto its full voltage?

Wrong direction of rotation

Speed too high

No residual magnetism

Open field

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YOUR ANSWER : ?

Laminations of core are generally made of

Case iron

Stainless steel

Carbon

Silicon steel

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Magnetic field in a D.C. generator is produced by

Electromagnets

Both (A) and (B)

None of these

Permanent magnets

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YOUR ANSWER : ?

The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except

Field weakening due to armature reaction and armature

Armature reaction

Commutation

Armature resistance drop

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YOUR ANSWER : ?