Civil Engineering  GATE Exam Questions  Discussion
Discussion :: GATE Exam Questions  Section 4 (Q.No.1)
1. 
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
Explanation:
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 