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DC Generators

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

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

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DC Generators
In a dc machine, the number of commutator segment is equal to

Numbers of conductors
Twice the number of poles
Number of coils
None of the listed here

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DC Generators
The voltage drop for which of the following types of brush can be expected to be least?

Metal graphite brushes
None of these
Graphite brushes
Carbon brushes

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DC Generators
An 8 pole duplex lap winding will have ______ parallel paths.

4
16
32
8

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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

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

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DC Generators
_____ together are called stray losses.

Copper and iron losses
Frictional loss and copper loss
Iron and friction losses
Field copper loss and iron loss

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