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UPSC Civil Service Exam Questions - Engineering

Q1:

In a hydraulic jump occurring in a horizontal rectangular channel, the sequent depths are 0.3 m and 1.2 m. What is the approximate value of energy loss in the jump ?

A 1.5 m

B 0.9 m

C 0.5 m

D 0.35 m

ANS:C - 0.5 m

Energy loss = (y2-y1)^3/4 * y1 * y2,
= (1.2 - 0.3)^3 / 4 * 1.2 * 0.3,
= 0.5.