# Civil Engineering - GATE Exam Questions - Discussion

Discussion Forum : 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 :

Discussion:

16 comments Page 1 of 2.
Abhishek thakur said:
2 years ago

@Deepakbaswal.

Yes, you are right. Thanks.

Yes, you are right. Thanks.

Abhishek thakur said:
2 years ago

@Deepakbaswal.

Yes, you are right. Thanks.

Yes, you are right. Thanks.

Chiku said:
2 years ago

h = flv^2 / 2gD, as for both case, all the factor is same, so the ratio for the head loss will be 1.

Gumin said:
2 years ago

hl = fL(16Q^2)/2g(3.14^2)Xd^5 in terms of discharge.

for half flow it will be 8Q^2,

So, it will be 16/8 =2,

A is the correct answer.

for half flow it will be 8Q^2,

So, it will be 16/8 =2,

A is the correct answer.

Bisy said:
2 years ago

Here 0.81/0.50 = 1.63.

Bhutan said:
4 years ago

Head loss per unit length is independent of sewer running full or half full condition

Keshav Kaushik said:
4 years ago

Head Loss per unit length is independent of sewer running in full or half full condition.

Utsav said:
4 years ago

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.

V = volumetric flow rate remains same.

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

Dolly said:
5 years ago

C must be the correct answer.

Naina paliwal said:
5 years ago

Please explain the solution with the correct formula.

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