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DC Generators

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

5 m
0.5 m
0.005 mm
0.05 mm

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DC Generators
If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be

Small
The same as rated voltage
High
Zero

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DC Generators
In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except

Compensating winding
Dummy coils
Shifting of axis of brushes
Interpoles

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DC Generators
In a D.C. generator the ripples in the direct e.m.f. generated are reduced by

Using carbon brushes of superior quality
Using equalizer rings
Using conductor of annealed copper
Using commutator with large number of segments

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DC Generators
The armature copper loss in a dc generator is a

Stray loss
Variable loss
None of the listed here
Constant loss

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DC Generators
In a short shunt compound wound generator, the shunt field is connected in parallel with

Series combination of armature and series field
Armature
Parallel combination of armature and series field
Series field

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