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DC Generators

DC Generators
The critical resistance of the D.C. generator is the resistance of

Field
Armature
Brushes
Load

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DC Generators
The yoke of a dc machine carries ______ pole flux.

None of the listed here
Two times the
Three times
One-half of

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DC Generators
To avoid formation of grooves in the commutator of a D.C. machine

All of these
The brushes of opposite polarity should track each other
The brushes of same polarity should track each other
Brush position has no effect on the commutator grooving

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DC Generators
Which of the following generator provides approximately constant voltage from no load to full load?

Shunt
Series
Over compounded
Flat compounded

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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

4.5%
2.8%
9.1%
11.3%

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

Armature reaction
Field weakening due to armature reaction and armature
Armature resistance drop
Commutation

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