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Hot questions in Environmental Engineering
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1
GATE Civil 2021 Set 2 | Question: 51
An activated sludge process $\text{(ASP)}$ is designed for secondary treatment of $7500\:m^{3}/$day of municipal wastewater. After primary clarifier, the ultimate $\text{BOD}$ of the influent, which enters into $\text{ASP}$ ... underflow volume (in $m^{3}$/day, $\textit{round off to one decimal place}$) of sludge wastage is _______________________
An activated sludge process $\text{(ASP)}$ is designed for secondary treatment of $7500\:m^{3}/$day of municipal wastewater. After primary clarifier, the ultimate $\text{...
go_editor
5.3k
points
go_editor
asked
Mar 1, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set2
numerical-answers
sludge-disposal
activated-sludge-process
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–
1
votes
0
answers
2
Made Easy Gate Previous year Questions
If we have 3 samples Initial DO. Final DO. Volume 1. 9.2 6.9 5 2. 9.1 4.4 10 3. 8.4 0 50 Do we need to consider last sample for finding average BOD?
If we have 3 samples Initial DO. Final DO. Volume1. 9.2 6.9 52. 9.1 4.4 ...
Don6
130
points
Don6
asked
May 11, 2021
Water and Waste Water Quality and Treatment
gatecivil
water-treatment-plant
bod-rate-constant
wastewater
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–
0
votes
0
answers
3
GATE Civil 2021 Set 2 | Question: 17
Which of the following statement$\text{(s)}$ is/are correct? Increased levels of carbon monoxide in the indoor environment result in the formation of carboxyhemoglobin and the long term exposure becomes a cause of cardiovascular diseases ... in the indoor environment will result in the formation of photochemical smog which is a cause of cardiovascular diseases
Which of the following statement$\text{(s)}$ is/are correct?Increased levels of carbon monoxide in the indoor environment result in the formation of carboxyhemoglobin and...
go_editor
5.3k
points
go_editor
asked
Mar 1, 2021
Air Pollution
gatecivil-2021-set2
multiple-selects
types-of-pollutants
sources-and-impacts
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–
0
votes
0
answers
4
GATE Civil 2021 Set 2 | Question: 15
The hardness of a water sample is measured directly by titration with $\text{0.01 M}$ solution of ethylenediamine tetraacetic acid $\text{(EDTA)}$ using eriochrome black $\text{T (EBT)}$ as an indicator. The $\text{EBT}$ reacts ... colour of the solution changes from blue-green to reddish brown blue to colourless reddish brown to pinkish yellow Wine red to blue
The hardness of a water sample is measured directly by titration with $\text{0.01 M}$ solution of ethylenediamine tetraacetic acid $\text{(EDTA)}$ using eriochrome black ...
go_editor
5.3k
points
go_editor
asked
Mar 1, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set2
basics-of-water-quality-standards
physical-chemical-and-biological-parameters
hardness-of-water
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–
0
votes
0
answers
5
GATE Civil 2021 Set 2 | Question: 52
A grit chamber of rectangular cross-section is to be designed to remove particles with diameter of $\text{0.25 mm}$ and specific gravity of $2.70$. The terminal settling velocity of the particles is estimated as $\text{2.5 cm/s}$. The ... the chamber (in $\text{m}, \textit{in integer}$) to remove $\text{0.25 mm}$ particles completely is ____________________
A grit chamber of rectangular cross-section is to be designed to remove particles with diameter of $\text{0.25 mm}$ and specific gravity of $2.70$. The terminal settling ...
go_editor
5.3k
points
go_editor
asked
Mar 1, 2021
Municipal Solid Wastes
gatecivil-2021-set2
numerical-answers
engineered-system-for-solid-waste-management
treatment-and-disposal
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–
0
votes
0
answers
6
GATE Civil 2021 Set 2 | Question: 14
Determine the correctness or otherwise of the following Assertion $\text{[a]}$ and the Reason $\text{[r]}$. $\text{Assertion [a]}$: One of the best ways to reduce the amount of solid wastes is to reduce the consumption of raw materials. $\text{Reason [r]}$: Solid ... Both $\text{[a]}$ and $\text{[r]}$ are false $\text{[a]}$ is true but $\text{[r]}$ is false
Determine the correctness or otherwise of the following Assertion $\text{[a]}$ and the Reason $\text{[r]}$.$\text{Assertion [a]}$: One of the best ways to reduce the amou...
go_editor
5.3k
points
go_editor
asked
Mar 1, 2021
Municipal Solid Wastes
gatecivil-2021-set2
solid-waste-management
generation
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–
0
votes
0
answers
7
GATE Civil 2021 Set 2 | Question: 32
Read the statements given below. Value of the wind profile exponent for the 'very unstable' atmosphere is smaller than the wind profile exponent for the 'neutral' atmosphere. Downwind concentration of air pollutants due to an elevated point source will be ... is False and $\text{iii}$ is False $\text{iii}$ is False and $\text{iv}$ is False
Read the statements given below.Value of the wind profile exponent for the 'very unstable' atmosphere is smaller than the wind profile exponent for the 'neutral' atmosphe...
go_editor
5.3k
points
go_editor
asked
Mar 1, 2021
Air Pollution
gatecivil-2021-set2
sources-and-impacts-of-pollutants
+
–
0
votes
0
answers
8
GATE Civil 2021 Set 1 | Question: 28
A $50$ $\text{mL}$ sample of industrial wastewater is taken into a silica crucible. The empty weight of the crucible is $54.352$ $\text{g}$. The crucible with the sample is dried in a hot air oven at $104\;^{\circ}C$ till a constant weight of ... volatile solids is _____________________ $\text{15540 mg/L}$ $\text{8620 mg/L}$ $\text{6920 mg/L}$ $\text{1700 mg/L}$
A $50$ $\text{mL}$ sample of industrial wastewater is taken into a silica crucible. The empty weight of the crucible is $54.352$ $\text{g}$. The crucible with the sample ...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
primary-secondary-treatment
wastewater
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–
0
votes
0
answers
9
GATE Civil 2021 Set 1 | Question: 51
A baghouse filter has to treat $12\text{ m}^3/\text{s}$ of waste gas continuously. The baghouse is to be divided into $5$ ... $5 \text{ m}$ in length. The total number of bags ($\textit{in integer}$) required in the baghouse is __________________
A baghouse filter has to treat $12\text{ m}^3/\text{s}$ of waste gas continuously. The baghouse is to be divided into $5$ sections of equal cloth area such that one secti...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Air Pollution
gatecivil-2021-set1
numerical-answers
air-quality-standards-index-and-limits
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–
0
votes
0
answers
10
GATE Civil 2021 Set 1 | Question: 12
Which one of the following is correct? The partially treated effluent from a food processing industry, containing high concentration of biodegradable organics, is being discharged into a flowing river at a point $\text{P}$. If the rate of ... $1$ A young lake characterized by low nutrient content and low plant productivity is called $\textit{eutrophic lake}$
Which one of the following is correct?The partially treated effluent from a food processing industry, containing high concentration of biodegradable organics, is being di...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
primary-secondary-treatment
biochemical-oxygen-demand
+
–
0
votes
0
answers
11
GATE Civil 2021 Set 1 | Question: 13
The liquid forms of particulate air pollutants are dust and mist mist and spray smoke and spray fly ash and fumes
The liquid forms of particulate air pollutants aredust and mistmist and spraysmoke and sprayfly ash and fumes
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Air Pollution
gatecivil-2021-set1
air-pollution-sources
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–
0
votes
0
answers
12
GATE Civil 2021 Set 1 | Question: 33
A water sample is analyzed for coliform organisms by the multiple-tube fermentation method. The results of confirmed test are as follows: $\begin{array}{|cl|cI|cI|}\hline &\textbf{Sample size $ ... $110$ The $\text{MPN}$ of coliform organisms per $\text{100 mL}$ is $1100000$ $110000$ $1100$ $110$
A water sample is analyzed for coliform organisms by the multiple-tube fermentation method. The results of confirmed test are as follows:$\begin{array}{|cl|cI|cI|}\hline&...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
water-quality-index
fermentation-method
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–
0
votes
0
answers
13
GATE Civil 2021 Set 1 | Question: 11
Which one of the following statements is correct? Pyrolysis is an endothermic process, which takes place in the absence of oxygen Pyrolysis is an exothermic process, which takes place in the absence of oxygen Combustion is an endothermic ... takes place in the abundance of oxygen Combustion is an exothermic process, which takes place in the absence of oxygen
Which one of the following statements is correct?Pyrolysis is an endothermic process, which takes place in the absence of oxygenPyrolysis is an exothermic process, which ...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Municipal Solid Wastes
gatecivil-2021-set1
engineered-system-for-solid-waste-management
+
–
0
votes
0
answers
14
GATE Civil 2021 Set 1 | Question: 52
A secondary clarifier handles a total flow of $9600 \text{ m}^3\text{/d}$ from the aeration tank of a conventional activated-sludge treatment system. The concentration of solids in the flow from the aeration tank is $3000\text{ mg/L}$. ... . The surface area of the designed clarifier for thickening (in $\text{m}^2$, $\textit{in integer}$) is ___________________
A secondary clarifier handles a total flow of $9600 \text{ m}^3\text{/d}$ from the aeration tank of a conventional activated-sludge treatment system. The concentration of...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
numerical-answers
sludge-disposal
activated-sludge-treatement
+
–
0
votes
0
answers
15
GATE Civil 2021 Set 1 | Question: 34
Ammonia nitrogen is present in a given wastewater sample as the ammonium ion $\text({NH}_{4}$^{+})$ and ammonia $\text({NH}_{3})$. If $ ... _{3}$ will be found in equal measures At $\text{pH}$ $7.0$, $\text{NH}_{4}$^{+}$ will be predominant
Ammonia nitrogen is present in a given wastewater sample as the ammonium ion $\text({NH}_{4}$$^{+})$ and ammonia $\text({NH}_{3})$. If $\text{pH}$ is the only deciding fa...
Arjun
13.0k
points
Arjun
asked
Feb 19, 2021
Water and Waste Water Quality and Treatment
gatecivil-2021-set1
chemical-biological-parameters
+
–
0
votes
0
answers
16
GATE2020-CE-1-25
A river has a flow of $1000$ million litres per day (MLD), $BOD_5$ of $5\:mg/litre$ and Dissolved Oxygen (DO) level of $8\:mg/litre$ before receiving the wastewater discharge at a location. For the existing environmental conditions, the saturation ... complete mixing of wastewater and river water, the immediate DO deficit (in $mg/litre$ round off to two decimal places), is ______.
A river has a flow of $1000$ million litres per day (MLD), $BOD_5$ of $5\:mg/litre$ and Dissolved Oxygen (DO) level of $8\:mg/litre$ before receiving the wastewater disch...
go_editor
5.3k
points
go_editor
asked
Feb 27, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-1
numerical-answers
effluent-discharge-standards
biochemical-oxygen-demand
+
–
0
votes
0
answers
17
GATE2020-CE-1-53
A gaseous chemical has a concentration of $41.6\:\mu mol/m^3$ in air at $1$ atm pressure and temperature $293\:K$. The universal gas constant $R$ is $82.05\times10^{-6}\;(m^3\:atm)/(mol\:K)$. Assuming that ideal gas law is valid , the concentration of the gaseous chemical (in ppm, round off to one decimal place), is ______.
A gaseous chemical has a concentration of $41.6\:\mu mol/m^3$ in air at $1$ atm pressure and temperature $293\:K$. The universal gas constant $R$ is $82.05\times10^{-6}\;...
go_editor
5.3k
points
go_editor
asked
Feb 27, 2020
Air Pollution
gate2020-ce-1
air-pollution
universal-gas
+
–
0
votes
0
answers
18
GATE2020-CE-1-54
A stream with a flow rate of $5\:m^3/s$ is having an ultimate BOD of $30\:mg/litre$. A wastewater discharge of $0.20\:m^3/s$ having $BOD_5\:\text{of}\:500\:mg/litre$ joins the stream at a location and instantaneously gets mixed up completely. The ... $e$). The BOD (in mg/litre, round off to two decimal places) remaining at $3\:km$ downstream from the mixing location, is __________
A stream with a flow rate of $5\:m^3/s$ is having an ultimate BOD of $30\:mg/litre$. A wastewater discharge of $0.20\:m^3/s$ having $BOD_5\:\text{of}\:500\:mg/litre$ join...
go_editor
5.3k
points
go_editor
asked
Feb 27, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-1
water-and-waste-water
numerical-answers
wastewater-discharge
bod
+
–
0
votes
0
answers
19
GATE2020 CE-2-16
The relationship between oxygen consumption and equivalent biodegradable organic removal (i.e.,BOD) in a closed container with respect to time is shown in the figure Assume that the rate of oxygen consumption is directly proportional to the amount of degradable organic matter and is expressed as ... is $BOD_5 = L_5$ $BOD_t = L_0-L_t$ $L_0 = L_te^{-kt}$ $L_t = L_0(1-e^{-kt})$
The relationship between oxygen consumption and equivalent biodegradable organic removal (i.e.,BOD) in a closed container with respect to time is shown in the figureAssum...
go_editor
5.3k
points
go_editor
asked
Feb 13, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-2
environmental-engineering
effluent-discharge-standards
biological-oxygen-demand
+
–
0
votes
0
answers
20
GATE2020 CE-2-53
A waste to energy plant burns dry solid waste of composition: Carbon $= 35\%$, Oxygen $= 26\%$ , Hydrogen $= 10\%$, Sulphur $= 6\%$, Nitrogen $= 3\%$ and Inerts $= 20\%.$ Burning rate is $1000\: $ tonnes/d. Oxygen in air ... The stoichiometric (theoretical) amount of air ( in tonnes/d, round off to the nearest integer) required for complete burning of this waste is ________.
A waste to energy plant burns dry solid waste of composition: Carbon $= 35\%$, Oxygen $= 26\%$ , Hydrogen $= 10\%$, Sulphur $= 6\%$, Nitrogen $= 3\%$ and Inerts $= 20\%.$...
go_editor
5.3k
points
go_editor
asked
Feb 13, 2020
Municipal Solid Wastes
gate2020-ce-2
numerical-answers
engineered-system-for-solid-waste-management
+
–
0
votes
0
answers
21
GATE2020 CE-2-17
A gas contains two types of suspended particles having average sizes of $2\: \mu m$ and $50\: \mu m$. Amongst the options given below, the most suitable pollution control strategy for removal of these ... bag filter electrostatic precipitator followed by venturi scrubber electrostatic precipitator followed by cyclonic separator bag filter followed by electrostatic precipitator
A gas contains two types of suspended particles having average sizes of $2\: \mu m$ and $50\: \mu m$. Amongst the options given below, the most suitable pollution control...
go_editor
5.3k
points
go_editor
asked
Feb 13, 2020
Air Pollution
gate2020-ce-2
air-pollution-control
+
–
0
votes
0
answers
22
GATE2020 CE-2-52
The ion product of water $(pK_w)$ is $14$. If a rain water sample has a $pH$ of $5.6$, the concentration of $OH^-$ in the sample (in $10^{-9}\: \text{mol/litre}$, round off to one decimal place), is ________.
The ion product of water $(pK_w)$ is $14$. If a rain water sample has a $pH$ of $5.6$, the concentration of $OH^-$ in the sample (in $10^{-9}\: \text{mol/litre}$, round o...
go_editor
5.3k
points
go_editor
asked
Feb 13, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-2
numerical-answers
physical-chemical-and-biological-parameters
ph-scale
+
–
0
votes
0
answers
23
GATE2020 CE-2-54
A sample of water contains an organic compound $C_8H_{16}O_8$ at a concentration of $10^{-3}\: \text{mol/litre}$. Given that the atomic weight of $C = 12\: \text{g/mol}, H = 1\: \text{g/mol}$, and $O = 16\: \text{g/mol}$, the theoretical oxygen demand of water (in $g$ of $O_2$ per litre, round off to two decimal places), is ________.
A sample of water contains an organic compound $C_8H_{16}O_8$ at a concentration of $10^{-3}\: \text{mol/litre}$. Given that the atomic weight of $C = 12\: \text{g/mol}, ...
go_editor
5.3k
points
go_editor
asked
Feb 13, 2020
Water and Waste Water Quality and Treatment
gate2020-ce-2
numerical-answers
water-and-waste-water
physical-chemical-and-biological-parameters
+
–
0
votes
0
answers
24
GATE2017 CE-2-8
As per Noise Pollution (Regulation and Control) Rules $2000$ of India, the day time noise limit for a residential zone, expressed in dB(A)L$_{eq}$, is $55$ $65$ $75$ $85$
As per Noise Pollution (Regulation and Control) Rules $2000$ of India, the day time noise limit for a residential zone, expressed in dB(A)L$_{eq}$, is$55$$65$$75$$85$
gatecse
4.0k
points
gatecse
asked
Aug 7, 2019
Noise Pollution
gate2017-ce-2
noise-pollution
environmental-engineering
permissible-limits-of-noise-pollution
+
–
0
votes
0
answers
25
GATE2017 CE-2-9
Following observations have ben made for the elevation and temperature to ascertain the stability of the atmosphere: $\begin{array}{|c|c|} \hline \text{Elevation (in m) } & \text{Temperature (in }^{\circ} \text{C)} \\ \hline 10 & 15.5 \\ \hline 60 & 15.0 \\ \hline 130 & 14.3 \\ \hline \end{array}$ The atmosphere is classified as Stable Unstable Neutral Inverse
Following observations have ben made for the elevation and temperature to ascertain the stability of the atmosphere:$$\begin{array}{|c|c|} \hline \text{Elevation (in m) }...
gatecse
4.0k
points
gatecse
asked
Aug 7, 2019
Air Pollution
gate2017-ce-2
environmental-engineering
air-pollution
atmosphere
+
–
0
votes
0
answers
26
GATE2017 CE-2-50
The composition of a municipal solid waste sample is given below: ... The difference between the energy content of the waste sample calculated on dry basis and as-discarded basis (in kJ/kg) would be _______
The composition of a municipal solid waste sample is given below:$\begin{array}{|l|c|c|c|} \hline \text{Component} & \text{Percent by} & \text{Moisture Content} & \text{E...
gatecse
4.0k
points
gatecse
asked
Aug 7, 2019
Municipal Solid Wastes
gate2017-ce-2
numerical-answers
municipal-solid-wastes
environmental-engineering
engineered-system-for-solid-waste-management
+
–
0
votes
0
answers
27
GATE2017 CE-2-52
A municipal corporation is required to treat $1000 \: m^3/day$ of water. It is found that an overflow rate of $20 m/day$ will produce a satisfactory removal of the discrete suspended particles at a depth of $3 m$. The diameter (in meters, round to the nearest integer) of a circular settling tank designed for the removal of these particles would be ___________
A municipal corporation is required to treat $1000 \: m^3/day$ of water. It is found that an overflow rate of $20 m/day$ will produce a satisfactory removal of the discre...
gatecse
4.0k
points
gatecse
asked
Aug 7, 2019
Municipal Solid Wastes
gate2017-ce-2
numerical-answers
municipal-solid-waste
environmental-engineering
engineered-system-for-solid-waste-management
+
–
0
votes
0
answers
28
GATE2017 CE-2-51
For a given water sample, the ratio between BOD$_{\text{5-day, 20}^{\circ} C}$ and the ultimate BOD is $0.68$. The value of the reaction rate constant $k$ (on base $e$) (in day$^{-1}$, up to two decimal places) is ________
For a given water sample, the ratio between BOD$_{\text{5-day, 20}^{\circ} C}$ and the ultimate BOD is $0.68$. The value of the reaction rate constant $k$ (on base $e$) (...
gatecse
4.0k
points
gatecse
asked
Aug 7, 2019
Water and Waste Water Quality and Treatment
gate2017-ce-2
numerical-answers
water-and-waste-water-quality-and-treatment
environmental-engineering
biological-oxygen-demand
+
–
0
votes
0
answers
29
GATE2017 CE-2-10
The most important type of species involved in the degradation of organic matter in the case of activated sludge process is autotrophs heterotrophs prototrophs photo-autotrophs
The most important type of species involved in the degradation of organic matter in the case of activated sludge process isautotrophsheterotrophsprototrophsphoto-autotrop...
gatecse
4.0k
points
gatecse
asked
Aug 7, 2019
Water and Waste Water Quality and Treatment
gate2017-ce-2
water-and-waste-water-quality-and-treatment
environmental-engineering
sludge-disposal
activated-sludge-process
+
–
1
votes
1
answer
30
GATE2017 CE-1: 55
The wastewater having an organic concentration of $54$ mg/l is flowing at a steady rate of $0.8 \: m^3/day$ through a detention tank of dimensions $2m \times 4 m \times 2 m$. If the contents of the tank are well mixed and the decay constant $0.1$ per day, the outlet concentration (in mg/l, up to one decimal place) is _________
The wastewater having an organic concentration of $54$ mg/l is flowing at a steady rate of $0.8 \: m^3/day$ through a detention tank of dimensions $2m \times 4 m \times 2...
Milicevic3306
11.9k
points
Milicevic3306
asked
Mar 26, 2018
Water and Waste Water Quality and Treatment
gate2017-ce-1
numerical-answers
steady-rate
water-and-waste-water-quality-and-treatment
environmental-engineering
+
–
0
votes
0
answers
31
GATE2019 CE-2: 41
Raw municipal solid waste (MSW) collected from a city contains $70 \%$ decomposable material that can be converted to methane. The water content of the decomposable material is $35\%$. An elemental analysis of the decomposable material yields the following mass percent. ... The mass of methane produced (in grams, round off to $1$ decimal place) per kg of raw MSW will be _________
Raw municipal solid waste (MSW) collected from a city contains $70 \%$ decomposable material that can be converted to methane. The water content of the decomposable mater...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Municipal Solid Wastes
gate2019-ce-2
numerical-answers
municipal-solid-waste
environmental-engineering
engineered-systems-solid-waste-management
+
–
0
votes
0
answers
32
GATE2019 CE-2: 42
Consider the reactor shown in the figure. The flow rate through the reactor is $Q \: m^3/h$. The concentrations (in $mg/L$) of a compound in the influent and effluent are $C_0$ and $C$, respectively. The compound is degraded in the reactor following the first order ... $L_{\text{CMFR}}/L_{\text{PFR}}$ (round off to $2$ decimal places) is ____________
Consider the reactor shown in the figure. The flow rate through the reactor is $Q \: m^3/h$. The concentrations (in $mg/L$) of a compound in the influent and effluent are...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-2
numerical-answers
environmental-engineering
water-and-waste-water
effluent-discharge-standards
+
–
0
votes
0
answers
33
GATE2019 CE-1: 18
Which one of the following is a secondary pollutant? Ozone Carbon Monoxide Hydrocarbon Volatile Organic Carbon (VOC)
Which one of the following is a secondary pollutant?OzoneCarbon MonoxideHydrocarbonVolatile Organic Carbon (VOC)
Arjun
13.0k
points
Arjun
asked
Feb 14, 2019
Air Pollution
gate2019-ce-1
air-pollution
environmental-engineering
types-of-pollutants
+
–
0
votes
0
answers
34
GATE2019 CE-2: 40
A water treatment plant treats $6000 \: m^3$ of water per day. As a part of the treatment process, discrete particles are required to be settled in a clarifier. A column test indicates that an overflow rate of $1.5 \: m$ per hour would produce the desired removal of ... of $3.0 \:m$. The volume of the required clarifier, (in $m^3$, round off to $1$ decimal place) would be ______
A water treatment plant treats $6000 \: m^3$ of water per day. As a part of the treatment process, discrete particles are required to be settled in a clarifier. A column ...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-2
numerical-answers
water-and-waste-water
environmental-engineering
water-treatment-plant
+
–
0
votes
0
answers
35
GATE2019 CE-2: 32
Chlorine is used as the disinfectant in a municipal water treatment plant. It achieves $50$ percent of disinfection efficiency measured in terms of killing the indicator microorganisms (E-Coli) in $3$ minutes. The minimum time required to achieve $99$ percent disinfection efficiency would be $9.93$ minutes $11.93$ minutes $19.93$ minutes $21.93$ minutes
Chlorine is used as the disinfectant in a municipal water treatment plant. It achieves $50$ percent of disinfection efficiency measured in terms of killing the indicator ...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-2
water-and-waste-water
environmental-engineering
water-treatment-plant
+
–
0
votes
0
answers
36
GATE2019 CE-1: 34
Sedimentation basin in a water treatment plant is designed for a flow rate of $0.2 \: m^3/s$. The basin is rectangular with a length of $32 \: m$, width of $8 \:m $, and depth of $4 \: m$. Assume that the settling velocity of these particles is governed by ... diameter $25 \mu m$ (spherical and uniform), the removal efficiency of these particles is $51 \%$ $65 \%$ $78 \%$ $100 \%$
Sedimentation basin in a water treatment plant is designed for a flow rate of $0.2 \: m^3/s$. The basin is rectangular with a length of $32 \: m$, width of $8 \:m $, and ...
Arjun
13.0k
points
Arjun
asked
Feb 14, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-1
water-and-waste-water
environmental-engineering
water-treatment-plant
sedimentation
+
–
0
votes
0
answers
37
GATE2019 CE-1: 42
A wastewater is to be disinfected with $35 \: mg/L$ of chlorine to obtain $99 \%$ kill of micro-organisms. The number of micro-organisms remaining alive $(N_t)$ at time $t$, is modelled by $N_t=N_o e^{-kt}$, where $N_o$ is number of micro-microorganisms at $t=0$, ... $1.0 \: m$, respectively, the length of the tank (in $m$, round off to $2$ decimal places) is ________
A wastewater is to be disinfected with $35 \: mg/L$ of chlorine to obtain $99 \%$ kill of micro-organisms. The number of micro-organisms remaining alive $(N_t)$ at time $...
Arjun
13.0k
points
Arjun
asked
Feb 14, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-1
numerical-answers
water-and-waste-water
environmental-engineering
wastewater-treatment-plant
chlorination-process
+
–
0
votes
0
answers
38
GATE2019 CE-1: 40
A sample of air analysed at $0^{\circ} C$ and $1 \: atm$ pressure is reported to contain $0.02 \: ppm$ (parts per million) of $NO_2$. Assume the gram molecular mass of $NO_2$ as $46$ and its volume at $0^{\circ} C$ and $1 \: atm$ pressure as $22.4$ litres per mole. The equivalent $NO_2$ concentration (in microgram per cubic meter, round off to $2$ decimal places) would be ________
A sample of air analysed at $0^{\circ} C$ and $1 \: atm$ pressure is reported to contain $0.02 \: ppm$ (parts per million) of $NO_2$. Assume the gram molecular mass of $N...
Arjun
13.0k
points
Arjun
asked
Feb 14, 2019
Air Pollution
gate2019-ce-1
numerical-answers
environmental-engineering
air-pollution
air-quality-index
+
–
0
votes
0
answers
39
GATE2019 CE-2: 10
Analysis of a water sample revealed that the sample contains the following species. $CO_3^{2-}, Na^+, H^+, PO_4^{3-}, Al^{3+}, H_2CO_3, Cl^-, Ca^{2+}, Mg^{2+}, HCO_3^-, Fe^{2+}, OH^-$ ... $CO_3^{2-}, H^+, H_2CO_3, HCO_3^-$ $CO_3^{2-}, H_2CO_3, HCO_3^-, OH^-$ $H^+, H_2CO_3, HCO_3^-, OH^-$
Analysis of a water sample revealed that the sample contains the following species.$CO_3^{2-}, Na^+, H^+, PO_4^{3-}, Al^{3+}, H_2CO_3, Cl^-, Ca^{2+}, Mg^{2+}, HCO_3^-, Fe...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Water and Waste Water Quality and Treatment
gate2019-ce-2
water-and-waste-water
environmental-engineering
alkalinity
+
–
0
votes
0
answers
40
GATE2019 CE-2: 9
Which one of the following options contains ONLY primary air pollutants? Hydrocarbons and nitrogen oxides Hydrocarbons and ozone Ozone and peroxyacetyl nitrate Nitrogen oxides and peroxyacetyl nitrate
Which one of the following options contains ONLY primary air pollutants?Hydrocarbons and nitrogen oxidesHydrocarbons and ozoneOzone and peroxyacetyl nitrateNitrogen oxide...
Arjun
13.0k
points
Arjun
asked
Feb 12, 2019
Air Pollution
gate2019-ce-2
air-pollution
environmental-engineering
types-of-pollutants
+
–
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