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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?

0.005 mm
5 m
0.05 mm
0.5 m

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DC Generators
The current in armature conductors of a dc machine is ______

Ac
Pulsating dc
Pure dc plus pulsating dc
Pure dc

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DC Generators
A 4-pole dc machine has _____ magnetic circuits.

2
4
8
6

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DC Generators
In a D.C. machine stray loss is the sum of

Iron loss and mechanical loss
Armature copper loss and iron loss
Total copper loss and mechanical loss
Shunt field copper loss and mechanical loss

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DC Generators
The no load voltage of a generator is 240 V and rated load voltage is 220 V. The voltage regulation of the generator is

9.1%
4.5%
11.3%
2.8%

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

Variable loss
Constant loss
Stray loss
None of the listed here

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