Civil Engineering - UPSC Civil Service Exam Questions - Discussion

1. 

A rectangular channel of 2.5 m width and 2 m depth of water carries a flow of 10 m3/s. The specific energy for the flow is given by

[A]. 1.18 m
[B]. 3.4 m/s
[C]. 2.0 m/s
[D]. 2.2 m

Answer: Option B

Explanation:

No answer description available for this question.

Penny said: (Apr 10, 2017)  
I think the correct answer is D.

Chhaya said: (Jun 8, 2017)  
How to calculate it? @Penny.

Please, anyone explain the solution.

Abirami said: (Jun 30, 2017)  
How to calculate it ?

Arya said: (Jul 12, 2017)  
Emin = 3/2Yc,
Yc=(q2/g)^(1/3),
q=Q/B.

Roy said: (Nov 28, 2017)  
Answer should be D, E=h+v^2/2g.

Bhutan said: (Jun 4, 2019)  
We have E = h+v^2/2g
Here B=2.5m, H = 2m and Q = 10m^3/s.

q = Q/B = 10/2.5 = 4m^2/s.
V = q/h = 4/2 = 2m/s.
E = 2+2^2/(2*9.8) = 2.2m.

Pranjul Sahu said: (Jul 30, 2019)  
Specific energy define as channel bed to TEL head and its =y^2 + v^2/2g and v calculate by continuity equation Q=av hence option D is correct.

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