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DC Generators

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

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

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DC Generators
If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to

check armature insulation resistance
increase the speed of primemover
reverse the field connections
increase the field resistance

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

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

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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 conductor of annealed copper
Using commutator with large number of segments
Using equalizer rings

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

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

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DC Generators
Due to armature reaction, the main pole flux of a dc generator is

None of the listed here
Weakend only
Distorted only
Weakened as well as distorted

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