The conductor of an overhead transmission line has cross-sectional area of 2 cm2. If the specific gravity of the conductor material is 9.9 gm/cm3 and wind pressure is 1.5 kg/m length. The effective weight per metre of length (kg/m) of the conductor will be __________.

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SSC JE Electrical 10 Oct 2023 Shift 2 Official Paper-I
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  1. 5.48 kg/m
  2. 2.48 kg/m
  3. 3.48 kg/m
  4. 4.48 kg/m

Answer (Detailed Solution Below)

Option 2 : 2.48 kg/m
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Detailed Solution

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Concept

The effective weight per meter of the conductor is calculated by:

Wmaterial is the weight of the conductor material per meter

Wmaterial  =  Specific Gravity × Volume of 1 m conductor

Wwind is the wind pressure acting on the conductor per meter

Calculation

Given, A = 2 cm2 

Specific Gravity = 9.9 gm/cm3 

Wwind = 1.5 kg/m

Wmaterial  = 9.9 × 2 × 100 = 1980 gm = 1.98 kg/m

\(W_{t}=\sqrt{(1.98)^2+(1.5)^2}\) 

\(W_{t}=2.48\space kg/m\)

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