GATE CE Hydraulics PYQs & Answers — Page 2

Questions 11–20 of 46. Imported answers require independent review unless marked reviewed.

A 2 m wide rectangular channel is carrying a discharge of 30 m³/s at a bed slope of 1 in 300. Assuming the energy correction factor as 1.1 and acceleration due to gravity as 10 m/s², the critical depth of flow (in meters) is __________ (rounded off to 2 decimal places).

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A round-bottom triangular lined canal is to be laid at a slope of 1 in 1500, to carry a discharge of 25 m³/s. The side slopes of the canal cross-section are to be kept at 1.25H : 1V. If Manning’s roughness coefficient is 0.013, the flow depth (in meters) will be in the range of

Your answerChoose one option.

2.39 to 2.42

1.94 to 1.97

2.24 to 2.27

2.61 to 2.64

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A standard round bottom triangular canal section as shown in the figure has a bed slope of 1 in 200. Consider the Chezy’s coefficient as 150 m

/s.

Diagram for Civil Engineering question 57

The normal depth of flow, y (in meters) for carry a discharge of 20 m

/s is ____________ (rounded off to 2 decimal places).

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A spillway has unit discharge of 7.5 m

/s/m. The flow depth at the downstream horizontal apron is 0.5 m. The tail water depth (in meters) required to form a hydraulic jump is ________ (rounded off to 2 decimal places).

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A 2 m × 1.5 m tank of 6 m height is provided with a 100 mm diameter orifice at the center of its base. The orifice is plugged and the tank is filled up to 5 m height. Consider the average value of discharge coefficient as 0.6 and acceleration due to gravity (

) as 10 m/s

. After unplugging the orifice, the time (in seconds) taken for the water level to drop from 5 m to 3.5 m under free discharge condition is __________ (rounded off to 2 decimal places).

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A rectangular channel is 4.0 m wide and carries a discharge of 2.0 m

/s with a depth of 0.4 m. The channel transitions to a maximum width contraction at a downstream location, without influencing the upstream flow conditions. The width (in meters) at the maximum contraction is ______________ (rounded off to 2 decimal places).

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When a supercritical stream enters a mild-sloped (M) channel section, the type of flow profile would become ________.

Your answerChoose one option.

M₁

M₂

M₃

M₁ and M₂

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A very wide rectangular channel carries a discharge (Q) of 70 m³/s per meter width. Its bed slope changes from 0.001 to 0.009 at a point P, as shown in the figure (not to scale). The Manning’s roughness coefficient of the channel is 0.01. What water surface profile(s) exist(s) near the point P?

Diagram for Civil Engineering question 43

Your answerChoose one option.

M₂ and S₂

M₂ only

S₂ only

S₂ and hydraulic jump

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A compound symmetrical open channel section as shown in the figure has a maximum of ______ critical depth(s).

Your answerChoose one option.

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A jet of water having a velocity of 20 m/s strikes a series of plates fixed radially on a wheel revolving in the same direction as the jet at 15 m/s. What is the percentage efficiency of the plates? (round off to one decimal place)

Your answerChoose one option.

37.5

66.7

50.0

88.9

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GATE CE Hydraulics PYQs

Question 35

Question 41

Question 57

Question 58

Question 58

Question 59

Question 19

Question 43

Question 43

Question 44