Question { 8451 }

WHY DOES NEUTRAL DO NOT CARRY EVEN THOUGH IT CARRIES RETURN
CURRENT?

Answer

Neutral carry return current equal to phase current but in
the scence of one phase.OR it carry in three phase
condition only when different current flowing conditon if
current will same in three phase then in neutral wire no
current return.

Question { 10192 }

Why do we have 110V, 230V, 415V etc. in electrical
transmissions? Why not 100V, 200V,400V?

Answer

Because we have allready asume that voltage drop in line
will be 10%.so after losses in voltage we can get at the
source point in the series of 100v,200v,400v.so we use
110v,220v,440v,voltage series.

Question { TATA, 15072 }

what is kVA

Answer

kva is the apparent power.we use kva rating for those
equipment those have not self power factor.that type of m/c
power factor depend upon load's power factor.for knowing
actual power(kw)=kva*cosΦ