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GATE 2018: Environmental Engineering Rapid Revision Quiz

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Question 1

Following happens to be the operating data for conventional activated sludge treatment plant :
(i) Waste water flow=40000 m³/d
(ii) Influent BOD= 300mg/l
(iii) Effluent BOD=30 mg/l
(iv) Mixed liquor suspended solids(MLSS)=2000 mg/l
(v) Volume of aeration tank=10000 m³
The Food/Microorganism (F/M) ratio (in kg BOD per day/kg of MLSS) is

Question 2

A 180 cc of water sample drawn on to a empty dry crucible whose initial mass is found to be 98.636 gm. After oven drying at 103’C its final mass is 98.697gm. Then it is kept in a muffle furnace at 700’C for an hour. After cooling the mass of the sample in crucible is 98.654gm. The volatile solids present in the water sample (in mg/lit) is

Question 3

The average sewage flow from a town is 400 MLD with a Population equivalent 600,000. The per capita BOD of sewage per day is 75g. Then average 5-day BOD (in mg/lit) is

Question 4

A water treatment plant is required to process 34570 m³/d of raw water (density = 1000 kg/m³, kinematic viscosity = 10^-6 m²/s). The rapid mixing tank imparts a velocity gradient of 1000s^-1 to blend 45 mg/L of alum with the flow for detention time of 2.5 minutes. The power input (in kW) required for rapid mixing is

Question 5

An ideal horizontal flow settling basin is 3.75 m deep having surface area 1150 m². Water flows at the rate of 9250 m³/d, at water temperature 20℃ (μ= 10^-3 kg/m-s and p = 1000 kg/m³). Assuming Stoke’s law to be valid, the proportion of spherical sand particles (0.01 mm in diameter with specific gravity 2.63) that will be removed is _____%.

Question 6

A coagulant treatment plant with a flow of 0.5 m³/sec and influent solid concentration of 50 mg/l requires 15 mg/l of alum. If the effluent suspended solids concentration is 15 mg/l, solid content of sludge is 1.5 percent and specific gravity of solids is 2.95, then the volume (in m³/day) of sludge that must be disposed is

Question 7

A trickling filter has the following features:
Recirculation ratio=1.5
(B.O.D.)₅ of raw sewage=250 mg/l
(B.O.D.) removal in primary settling tank = 40%
Sewage flow = 4.5 MLD, Volume of Trickling filter = 0.2 ha-m
The efficiency of the Trickling filter(using NRC formula) is

Question 8

A family of 7 people generates solid waste (SW) at the rate of 0.5 kg/capita/day and the bulk density of refuse in a typical garbage can is about 160 kg/m³. If the collection is done once in a three weeks, the number of 170 litres can require for household is

Question 9

The atmospheric layer closest to the earth surface is

Question 10

Consider the following statements.
(i) CO possesses about 200 times affinity for blood haemoglobin than oxygen.
(ii) Major source of corrosion is Taj Mahal is SO₂.
(iii) The most prominent air pollutant which causes severe damage to the plants is bromine.
(iv) When the ELR is more than ALR, it is known as stable environment.
Of these statements

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