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UPSC Civil Service Exam Questions - Engineering

Q1:

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

ANS:D - 2.2 m

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.