SSC JE Electrical Engineering 2011 Paper

Question : 142 of 150

Marks: +1, -0

The sag of the conductors of a transmission line is 2.5 m when the span is 250m. Now if the height of the supporting towers is increased by 25%, the sag will

reduce by 25%
increase by 25%
reduce by 12.5%
remain unchanged

Validate

Solution:

Sag of the conductor of a transmission line is not affected by increase in height of supporting towers.
Sag =

\Wl^2/{8T^2}

w = weight of conductor
l = span length
T = Tension in conductor

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