Question { 20034 }

how to reduce power loss when the tranmission under long
distance?

Answer

to reduce power loss in transmission lines
1)the voltage will have to be increased .but there will be
limitaions for this also
2) the distace between conductors should be as long as
possible to reduce inductance in case of ac transmission
3) highly conducting meterials based on the economy have to
be taken such as aluminium
4)power factor should be more .the more the power factor is
the less the current is .so losses are reduced
5)hvdc transmission is also another option

Question { 9620 }

which transmission is cheaper ac or dc?

Answer

ac transmission is cheaper though the losses in this are
high compared to dc
because dc cannot be stepped up directly and so the the
inverters and rectifiers comes into picture which has to
deal the high powers (in the order of mw).asn so the cost
is high

Question { 5981 }

what is different between auto transformer and vriac

Answer

autotransformer is just like a normal transformer provided
with tappings
but with variac any variation in the given range is possible
for example a 230v/270 v variac is used to vary the voltage
in range of (0-270)v