SSC JE Electrical Engineering 2014 Set 1 Paper

Question : 176 of 200

Marks: +1, -0

If voltage is increased by ‘n’ times, the size of the conductor would

Solution:

P = VI cosϕ

Power Loss

(W) = I^2R

R={δI}/ A

W=P^2/{V^2\cosϕ}×{δI}/ A

A= P^2/{WV^2}{δl}/{\cos^2ϕ}

Volume = Area × length
Volume =

{P^2{δl}}/{{WV^2} {\cos^2ϕ}}

So if voltage is increase by 'n' time then size will reduce by

1/n^2

time.

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