SSC JE Mechanical Engineering 25 Sep 2019 Shift 1 Paper

Question : 135 of 200

Marks: +1, -0

A horizontal pipe carries water flowing at a velocity of 10 m/s. The static pressure gauge readings at its inlet and outlet were 3 and 2.6 (kgf/cm

^2

). The head loss in the pipe is:

Solution:

Given:

P_{1}=3 {kgf} \/ {cm}^{2}, P_{2}=2.6 {kgf} \/ {cm}^{2}

1 {kgf} \/ {cm}^{2}={g} {N} \/ {cm}^{2}={g} \×10^{4} {N} \/ {m}^{2}

P_{1}-P_{2}=0.4 {kgf} \/ {cm}^{2}=0.4 {g} \×10^{4} {N} \/ {m}^{2}

{P_{1}}/{\ρ g}={P_{2}}/{\ρ g}+{h}_{{L}}

{h}_{{L}}={P_{1}-P_{2}}/{\ρ g}

={0.4 \×{g} \×10^{4}}/{10^{3} \×g}=4 {m}

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