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DC Generators

DC Generators
The brush voltage drop in dc machine is about _______

2 V
20 V
10 V
0.1 V

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DC Generators
_____ together are called stray losses.

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

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DC Generators
The armature of dc machine is laminated in order to reduce

Frictional loss
Eddy current loss
Hysteresis loss
Copper loss

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DC Generators
The current in armature conductors of a dc machine is ______

Pure dc plus pulsating dc
Ac
Pure dc
Pulsating dc

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DC Generators
Carbon brushes are used in a dc machine because _______

None of the listed here
Contact resistance is decreased
Carbon is cheap
Carbon lubricates and polishes the commutator

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DC Generators
The effect of armature reaction is to

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

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