Answer / bala sundaram

it will depend upon a machine.

alternator:
excitation current will increase means power factor will decrease bcoz E is increased & resultant E induced and load current phase angle is reduced so power factor reduced

synchronous motor
on over excitation it will increase a power factor.

Answer / gulshan goyal

it depends on the machine.If it is a motor and if we
increase excutation power will shift from lagging to
leading.as we increse the excitation angle will first
decrease as in lagging side than angle will increase in
leading side and hence the power factor will initially may
be .8 lagging than .9L,.95L,1 than .95 leading ,.9Ld,.8Ld

Answer / vishal

if exitation increase then power factor decrease, and if
exitation decrease then pf increace

Answer / j.ramkumar

the alternator load increase the excitation will increase
same time pf decrease we use our avr auto mode it will
maintain automatically

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