md saquib maqsood


{ City } keonjhar
< Country > india
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Question { IFFCO, 3361 }

Which loss in DC machine is maximum?


Answer

in dc machines the losses are core loss,cu loss,stray loss,
mechanical loss, brush loss.... in which mechanical loss is
maximum.

Is This Answer Correct ?    1 Yes 2 No

Question { 4781 }

what is the disadvantage of lagging power factor & why ?


Answer

The disadv of lag pf is that it causes the voltage regulation
to increase towards maximum value due to which the o/p volt
decreases.
volt reg= (V no load - V full load)
= IR cos phy - IX sin phy
in case of lag pf the current is lagging i.e I<-phy
so , the volt reg
= IR cos phy + IX sin phy is more


Is This Answer Correct ?    1 Yes 0 No