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DC GENERATORS

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

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

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DC Generators
To avoid formation of grooves in the commutator of a D.C. machine

The brushes of same polarity should track each other
All of these
Brush position has no effect on the commutator grooving
The brushes of opposite polarity should track each other

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

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

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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

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

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DC Generators
For a D.C. machines laboratory following type of D.C. supply will be suitable

Mercury are rectifier
Rotary converter
Synchronous motor D.C. generator set
Induction motor D.C. generator set

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