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DC Generators

DC Generators
In a D.C. generator the critical resistance refers to the resistance of

Load
Field
Armature
Brushes

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DC Generators
The terminal voltage of a _______ generator vary widely with changes in load current.

Shunt
Flat compounded
Series
None of the listed here

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DC Generators
Small dc machines generally have _____ poles.

2
8
4
6

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

5 m
0.05 mm
0.005 mm
0.5 m

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DC Generators
The overall efficiency of a dc generator is maximum when its variable loss is equal to

Iron loss
Constant loss
Mechanical loss
Stray loss

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DC Generators
Carbon brushes are used in a dc machine because _______

Contact resistance is decreased
Carbon lubricates and polishes the commutator
None of the listed here
Carbon is cheap

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