vamsi krishna


{ City } andhra pradesh
< Country > india
* Profession * student
User No # 118678
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Question { OMC, 2564 }

why in america the supply frequency is applied as 60 HZ.
but in india we use 50 HZ.


Answer

becoz the speed of alternator in u.s is 3600r.p.m
whereas in india is 3000r.p.m
F=(Ns*p)/120
mostly we prefer 2 pole machine,so p=2

Is This Answer Correct ?    2 Yes 0 No

Question { 7087 }

what are the advantages of having high voltage in transmission
lines?


Answer

if we use high voltage there is an increase in surge impedance loading(SIL)
SIL=((v^2)/Xc)=(I^2*Xl) ,that means we can increase power transfer capability of the line
so it is economical

Is This Answer Correct ?    0 Yes 0 No