GATE ES Environmental Hydraulics PYQs & Answers — Page 2

Questions 11–20 of 21. Imported answers require independent review unless marked reviewed.

Topic practice 21 questionsPage 2 of 3

A trapezoidal canal lined with cement concrete (n = 0.01) is designed to carry a discharge of 20 m

/s at a bed slope 1 in 400. If the bed width is twice the depth of flow and side slope of the canal section is 2 (1 vertical: 2 horizontal) then the corresponding depth of flow will be __________ (in m, rounded off to two decimal places).

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A plunger weighing 314 kN is balanced in a cylindrical vessel of diameter 1.5 m and filled with an oil (specific gravity 0.9) as shown in the following figure (not to the scale).

If a pressure gauge is connected with the vessel using 1.5 cm diameter tube, the reading of the gauge will be __________ (in kPa, rounded off to two decimal places).

Diagram for Environmental Science and Engineering question 53

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A pipeline is designed to deliver 20 L/s of an oil (kinematic viscosity =

/s and specific gravity = 0.9) under the laminar flow condition. The minimum diameter of the pipe will be __________ (in m, rounded off to two decimal places).

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Centrifugal pumps with suction pipe (shown by solid arrow) and delivery pipe (shown by dotted arrow) are shown in the figures. Choose the option that gives the correct connection

Your answerChoose one option.

Diagram for Environmental Science and Engineering question 20

Diagram for Environmental Science and Engineering question 20 (figure 2)

Diagram for Environmental Science and Engineering question 20 (figure 3)

Diagram for Environmental Science and Engineering question 20 (figure 4)

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A venturimeter along with a differential manometer was installed to measure flow in a water pipeline as shown in the following figure (not drawn to scale).

Diagram for Environmental Science and Engineering question 58

Taking specific weight of water as 9810 N/m

, the pressure difference (in Pa, rounded off to one decimal place) between point Q and P is __________.

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Two reservoirs having a difference of 10 m in their water surface elevations are connected by a pipeline (diameter = 10 cm, length = 50 m, and friction factor

). If the last 25 m length of the pipeline is replaced by a same material pipe of diameter 20 cm then neglecting minor losses the discharge (in %, rounded off to one decimal place) increase will be __________.

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The depth of flow (in m, rounded off to two decimal places) in a hydraulically efficient rectangular channel (n = 1/80) to carry a discharge of 64 m

/s at bed slope 0.01 is __________.

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In fluid statics, the line of action of the buoyant force always acts through the ____________________.

Your answerChoose one option.

centre of gravity of any submerged body

centroid of the volume of any floating body

centroid of the displaced volume of fluid by the body

centroid of the volume of fluid vertically above the body

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A water jet discharging from a 4 cm diameter orifice has a diameter of 3.5 cm at its vena contracta. The coefficient of velocity is defined as the ratio of the actual velocity of the jet at vena contracta to the theoretical velocity of the jet. If the coefficient of velocity is 0.98, the coefficient of discharge for the orifice will be __________ (rounded off to two decimal places).

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In open channel flow, the specific energy is the total energy per unit weight of a fluid, where the component potential energy is measured from the bed of the channel as the datum.

A rectangular channel of 10 m width carries 20 m³/s of water. The depth of flowing water is 1 m. The specific energy for this flow condition is ________ m (rounded off to one decimal place).

Consider acceleration due to gravity (g) = 10 m/s².

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GATE ES Environmental Hydraulics PYQs

Question 52

Question 53

Question 57

Question 20

Question 58

Question 59

Question 60

Question 5

Question 25

Question 44