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DC Generators

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

Pure dc
Pulsating dc
Ac
Pure dc plus pulsating dc

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DC Generators
The size of a dc generator can be reduced by using ______

Lap winding
Iron commutator
Magnetic material of high permeability
High resistance winding material

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DC Generators
The armature conductors of a 6 pole, lap wound dc generator are divided into

6 parallel paths
3 parallel paths
4 parallel paths
2 parallel paths

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DC Generators
The main factor which leads to unstable parallel operation of flat and over compounded generators is

unequal number of turns in their series field windings
unequal series field resistances
unequal speed regulation of their primemovers
their rising voltage characteristics

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DC Generators
D.C. generator generally preferred for charging automobile batteries is

Shunt generator
Long shunt compound generator
Any of the above
Series generator

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DC Generators
If the flux per pole of dc generator is halved but its speed is doubled, its generated emf will

Be halved
Be quadrupled
Be doubled
Remain the same

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