GATE ES Particulate pollutants PYQs & Answers

Questions 1–10 of 13. Imported answers require independent review unless marked reviewed.

In the design of air pollution control devices, size of the particles that are removed with 50% efficiency is termed as _____.

Your answerChoose one option.

mean size

mode size

cut size

median size

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Which ONE of the following options CORRECTLY matches the Criteria Air Pollutants with measurement methods used in Continuous Ambient Air Quality Monitoring Stations (CAAQMS) operated by Central Pollution Control Board (CPCB) given in the table?

Criteria Air Pollutants	Measurement Methods
(P) Sulphur Dioxide (SO , in μg/m )	(i) Chemiluminescence
(Q) Nitrogen Dioxide (NO , in μg/m )	(ii) Non Disperse Infra Red (NDIR) spectroscopy
(R) Particulate Matter (PM , in μg/m )	(iii) Ultraviolet fluorescence
(S) Carbon Monoxide (CO, in mg/m )	(iv) Beta attenuation

Your answerChoose one option.

(P) - (i); (Q) - (ii); (R) - (iii); (S) - (iv)

(P) - (iv); (Q) - (iii); (R) - (ii); (S) - (i)

(P) - (iii); (Q) - (i); (R) - (iv); (S) - (ii)

(P) - (ii); (Q) - (iii); (R) - (i); (S) - (iv)

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Standard deviation for the particulate matter (PM) concentrations listed in the table is ______ μg/m³ (rounded off to one decimal place).

Location No.	1	2	3	4	5	6	7
PM concentration (μg/m³)	45	40	55	65	60	35	50

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Which option gives the best control strategies for Dioxins and Furans in the flue gas emitted from waste incineration facilities?

Your answerChoose one option.

Avoid burning polystyrene (PS) and polyethylene (PE); ensure the furnace temperature above 1000 °C; and use a bag filter for cleaning the flue gas.

Avoid burning polyvinyl chloride (PVC); quickly cool down the flue gas through the temperature range 400 - 250 °C; and use an activated carbon treatment for the flue gas.

Avoid burning food wastes; ensure the furnace temperature above 900 ± 50 °C; and use an electrostatic precipitator (ESP) for cleaning the flue gas.

Avoid burning metal bearing waste; ensure the flue gas temperature above 1000 °C; and use a venturi scrubber for cleaning the flue gas.

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A particle disperser has 150 spherical particles of uniform density. An air purifier is proposed to be used to remove these particles. The diameter specific number of particles in the dispersed, along with the number removal efficiency of the proposed purifier is shown in the following table:

Diameter of the particle (µm)	Number of particles	Number removal efficiency (%)
1	1000	99
10	500	75
100	10	10

The overall mass removal efficiency of the proposed purifier is ______ %. (rounded off to one decimal place)

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An incandescent light bulb operated for two hours per day uses 12.2 kWh of energy per month. Burning of one kg of coal generates 2 kWh of electrical energy and releases 7 g of PM₁₀. The reduction in PM₁₀ emitted per month, if this incandescent bulb is replaced with a light emitting diode (LED) bulb that uses 1/6ᵗʰ of energy, is _____ g. (rounded off to one decimal place)

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The equipment that can be used to control particulate air pollution in an industrial unit is/are

Your answerSelect all correct options. You can choose more than one.

Electrostatic precipitator

Cyclone separator

Gravity settler

Incinerator

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A gravity settling chamber of height ‘H’ and length ‘L’ is designed to control particulate air pollution. In the chamber, the horizontal velocity of air flow is ‘Vₕ’ and terminal settling velocity of the target particle is ‘Vₜ’.

Which one of the following expressions is the correct concept used to calculate the minimum size of the target particle that will be removed with 100% efficiency?

Your answerChoose one option.

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In a cyclone separator of radius 25 cm, a particle is traveling with a gas stream at velocity of 18 m/s. The ratio of centrifugal force to the gravitational force acting on the particle is ______ (rounded off to 2 decimal places). Consider acceleration due to gravity (g) as 9.8 m/s

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A boiler in an industry, located where high plume rise is expected, releases flue gas with fine particulate matter. Which one of the following options is most suited and efficient if the particulate matter is intend for reuse?

Your answerChoose one option.

reduce stack height and increase stack diameter

use of wet collectors

use of flue gas desulfurization (FGD)

use of electrostatic precipitator (ESP)

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GATE ES Particulate pollutants PYQs

How to practice Particulate pollutants

Question 21

Question 39

Question 48

Question 42

Question 60

Question 61

Question 29

Question 41

Question 57

Question 40