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GATE Exam Questions - Engineering

Q1:

A person standing on the bank of a canal drops a stone on the water surface. He notices that the disturbance on the water surface in not travelling upstream. This is because the flow in the canal is

A sub-critical

B super-critical

C steady

D uniform

ANS:B - super-critical

For super-critical flow, Froude number>1
V>(gy)^1/2
V>C

Hence, on upstream the wave will be washed away and we will not be able to see them but they can be seen on the downstream side hence the floor is super critical.