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DC Generators

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

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

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DC Generators
In a four-pole D.C. machine

All the four poles are north poles
All the four poles are south poles
Two north poles follow two south poles
Alternate poles are north and south

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DC Generators
In dc generator, the generated voltage depend upon

Both speed and flux
Flux only
Speed only
None of the listed here

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DC Generators
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave

will be of v Hz 5
will be of 5 Hz
will be of 5 xiVHz
will be zero

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

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

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

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

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