Civil Engineering - GATE Exam Questions - Discussion


At the same mean velocity, the ratio of head loss per unit length for a sewer pipe flowing full to that for the same pipe flowing half full would be :

[A]. 2.0
[B]. 1.63
[C]. 1.00
[D]. 0.61

Answer: Option B


No answer description available for this question.

Shubham said: (Jul 18, 2016)  
Answer should be 1.

Because head loss per unit length does not depend on the depth of water in a sewer pipe.

Joshi said: (Dec 29, 2016)  
Thanks @Shubham.

Jimmy said: (Dec 30, 2016)  
Please explain in detail.

Deepakbaswal said: (Jun 17, 2017)  
(.81/.5) = 1.61.
Flowing full in pipe = 81%.
Flowing half in pipe= 50%.

Siva said: (Nov 25, 2017)  
You are right, I agree @Shubham.

Roy said: (Nov 26, 2017)  
1 is the correct answer.

Naina Paliwal said: (Jun 1, 2018)  
Please explain the solution with the correct formula.

Dolly said: (Aug 2, 2018)  
C must be the correct answer.

Utsav said: (Nov 23, 2018)  
Head loss due to friction/unit length of pipe is proportional to mean velocity square V^2 and inversely proportional to diameter D of the pipe.

V = volumetric flow rate remains same.

So, head loss due to friction: ratio when flowing full/when flowing half full = 1.

Keshav Kaushik said: (Jan 9, 2019)  
Head Loss per unit length is independent of sewer running in full or half full condition.

Bhutan said: (Jun 21, 2019)  
Head loss per unit length is independent of sewer running full or half full condition

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