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GATE (CE) : ENVIRONMENTAL ENGINEERING #2 (App update required to attempt this test)
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Question 1
Considering the process of coagulation, when the coagulants such as alum are used then
Question 2
A coagulant treatment plant with a flow of 0.6 m3/sec requires 18 mg/l of alum. The concentration of suspended solids in inflow of raw water is 40 mg/l. If the effluent suspended solids concentration is 12 mg/l, then concentration (in mg/l) of dry sludge removed is
Question 3
The population of a city is 20000 with an average water demand of 150 lpcd. Calculate the area required (m2) of rapid sand filter system for the treatment of water. Daily 4% of filtered water is required for backwashing and it is being done for a duration of 30 minute. Given the Rate of filtration is 6000 Litre/hr/m2.
Question 4
Consider a primary sedimentation tank (PST) in a water treatment plant with Surface Overflow Rate (SOR) of 40 m3/m2/d. The diameter of the spherical particle which will have 90 percent theoretical removal efficiency in this tank is _________ µm. Assume that settling velocity of the particle in water described by Stokes’ Law.
Given: Density of water = 1000 kg/m3; Density of particle = 2650 kg/m3; g = 9.81 m/s2; Kinematic viscosity of water (v) = 1.10 × 10–6 m2/s
Given: Density of water = 1000 kg/m3; Density of particle = 2650 kg/m3; g = 9.81 m/s2; Kinematic viscosity of water (v) = 1.10 × 10–6 m2/s
Question 5
If the specific gravity of a suspended particle is increased from 2 to 2.5, then the settling velocity changes from Vs to _____ Vs.
Question 6
A coagulation sedimentation plant clarifies 50 MLD of raw water having alkalinity equal to 4 mg/l as CaCO3. Filter alum required at the plant is 10 mg/l. Calculate the quick lime ( 88%) pure required per year by the plants in tonne/ year is-----
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Jul 14ESE & GATE CE