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DC Generators

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

Paper
Insulating varnish
Graphite
Mica

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

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

0.005 mm
0.05 mm
0.5 m
5 m

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DC Generators
Open circuited armature coil of a D.C. machine is

Both of the listed here
Indicated by a spark completely around the commutator
Identified by the scarring of the commutator segment to which open circuited coil is connected
None of these

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DC Generators
The rapid wear of brushes takes place due to

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

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DC Generators
The effect of armature reaction is to

Increase the total flux
Make the air gap flux uniform
Decrease the total flux
None of the listed here

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