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DC Generators

DC Generators
Current versus time graph for an ideal commutation is a

Straight line
Parabola
Hydrobola
None of the listed here

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DC Generators
The O. C. C. of a dc generator is also called its_______ characteristic.

No load saturation
External
Performance
Internal

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

More than
None of the listed here
About the same as
Less than

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DC Generators
The rapid wear of brushes takes place due to

Abrasion from dust
Excessive spring pressure
All of these
Rough commutator bars

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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

Zero
Small
High
The same as rated voltage

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

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

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