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UPSC Civil Service Exam Questions - Engineering

Q1:

What is the discharge corresponding to a critical depth of 1.20 m in a 3.0 m wide rectangular channel:

A 4.12 m3/s

B 4.94 m3/s

C 8.24 m3/s

D 12.35 m3/s

ANS:D - 12.35 m3/s

Yc = (q^2/g)^(1/3).
Yc = (Q^2/ B^2 * g)^(1/3).
Q = (Yc^3 x B^2x g)^1/3.
Q = 12.35 m^3/s.