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DC GENERATORS

DC Generators
The rapid wear of brushes takes place due to

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

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DC Generators
In case of D.C. machine winding, number of commutator segments is equal to

Number of armature coils
Number of armature conductors
Number of armature turns
Number of armature coil sides

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DC Generators
The insulating material used between the commutator segments is normally

Graphite
Insulating varnish
Mica
Paper

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DC Generators
The bearings used to support the rotor shafts are generally

Ball bearings
Magnetic bearings
Bush bearings
Needle bearings

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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

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

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