Civil Engineering
GATE CE topic:infrastructure PYQs
Build your understanding with focused practice from past exam papers.
Questions 371–380 of 1300. Imported answers require independent review unless marked reviewed.
Question 56
Open questionce-1NAT2 marksNeeds review
The ordinates of a 1-hour unit hydrograph (UH) are given below.
Time (hours) | 0 | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|---|
Ordinates of 1-hour UH (m /s) | 0 | 13 | 50 | 80 | 95 | 85 |
Time (hours) | 6 | 7 | 8 | 9 | 10 | 11 |
|---|---|---|---|---|---|---|
Ordinates of 1-hour UH (m /s) | 55 | 35 | 15 | 10 | 3 | 0 |
These ordinates are used to derive a 3-hour UH. The peak discharge (in m
/s) for the derived 3-hour UH is ______________ (rounded off to the nearest integer).Log in to check the answer
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Open questionCE2NAT2 marksNeeds review
A storm with a recorded precipitation of 11.0 cm, as shown in the table, produced a direct run-off of 6.0 cm.
Time from start (hours) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
Recorded cumulative precipitation (cm) | 0.5 | 1.5 | 3.1 | 5.5 | 7.3 | 8.9 | 10.2 | 11.0 |
The
-index of this storm is __________ cm/hr (rounded off to 2 decimal places).Log in to check the answer
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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. 
The normal depth of flow, y (in meters) for carry a discharge of 20 m
/s is ____________ (rounded off to 2 decimal places).Log in to check the answer
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A 500 m long water distribution pipeline P with diameter 1.0 m, is used to convey 0.1 m
/s of flow. A new pipeline Q, with the same length and flow rate, is to replace P. The friction factors for P and Q are 0.04 and 0.01, respectively. The diameter of the pipeline Q (in meters) is __________ (rounded off to 2 decimal places).Log in to check the answer
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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).Log in to check the answer
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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).Log in to check the answer
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A 5 m × 5 m closed tank of 10 m height contains water and oil, and is connected to an overhead water reservoir as shown in the figure. Use
= 10 kN/m
and specific gravity of oil = 0.8. 
The total force (in kN) due to pressure on the side PQR of the tank is __________ (rounded off to the nearest integer).
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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).Log in to check the answer
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Activated carbon is used to remove a pollutant from wastewater in a mixed batch reactor, which follows first-order reaction kinetics.
At a reaction rate of 0.38 /day, the time (in days) required to remove the pollutant by 95% is ____________ (rounded off to 1 decimal place).
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A circular settling tank is to be designed for primary treatment of sewage at a flow rate of 10 million liters/day. Assume a detention period of 2.0 hours and surface loading rate of 4000 liters/m
/day. The height (in meters) of the water column in the tank is ______________ (rounded off to 2 decimal places).Log in to check the answer
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