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Answer Posted / sibghatullah
since transformer and generator are acting as source due to
which the load connected to them can be inductive (lagging pf)
or capacitive(leading pf) or resistive.WE don't know about
the load before hand. Real power (KW) changes due to pf
change in (P= S*pf) ,but the total apparent
power KVA remain constant. so transformer and generator
power changes that's they are rated in KVA but motor' pf is
specified and acting as a load ,that's why motor rating is
always specified in KW. because its KW never changes!!
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