1
GATE CE 2025 Set 2
Numerical
+2
-0

A settling chamber is used for the removal of discrete particulate matter from air with following conditions. Horizontal velocity of air $=0.2 \mathrm{~m} / \mathrm{s}$; Temperature of air stream $=77^{\circ} \mathrm{C}$; Specific gravity of particle to be removed $=2.65$; Chamber length $=12 \mathrm{~m}$; Chamber height = 2 m ;

Viscosity of air at $77^{\circ} \mathrm{C}=2.1 \times 10^{-5} \mathrm{~kg} / \mathrm{m} . \mathrm{s}$;

Acceleration due to gravity $(\mathrm{g})=9.81 \mathrm{~m} / \mathrm{s}^2$; Density of air at $77^{\circ} \mathrm{C}=1.0 \mathrm{~kg} / \mathrm{m}^3$;

Assume the density of water as $1000 \mathrm{~kg} / \mathrm{m}^3$ and Laminar condition exists in the chamber.

The minimum size of particle that will be removed with 100\% efficiency in the settling chamber (in $\mu \mathrm{m}$ ) is ___________ (round off to one decimal place).

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2
GATE CE 2023 Set 2
MCQ (Single Correct Answer)
+2
-0.67

Match the following air pollutants with the most appropriate adverse health effects :

Air pollutant Health effect to human and/or test animal
(P) Aromatic hydrocarbons (IV) Carcinogenic effect
(Q) Carbon monoxide (I) Reduce the capability of the blood to carry oxygen
(R) Sulfur oxides (II) Bronchitis and pulmonary emphysema
(S) Ozone (III) Damage of chromosomes
A
(P) – (II), (Q) – (I), (R) – (IV), (S) – (III)
B
(P) – (IV), (Q) – (I), (R) – (III), (S) – (II)
C
(P) – (III), (Q) – (I), (R) – (II), (S) – (IV)
D
(P) – (IV), (Q) – (I), (R) – (II), (S) – (III)
3
GATE CE 2023 Set 1
MCQ (More than One Correct Answer)
+2
-0
Which of the following statements is/are TRUE in relation to the Maximum Mixing Depth (or Height) ‘Dmax’ in the atmosphere?
A
Dmax is always equal to the height of the layer of unstable air
B
Ventilation coefficient depends on Dmax
C
A smaller Dmax will have a smaller air pollution potential if other meteorological conditions remain same 
D
Vertical dispersion of pollutants occurs up to Dmax
4
GATE CE 2022 Set 2
Numerical
+2
-0

A sample of air analyzed at 25$$^\circ$$C and 1 atm pressure is reported to contain 0.04 ppm of SO2. Atomic mass of S = 32. O = 16. The equivalent SO2 concentration (in $$\mu$$g/m2) will be __________. (round off to the nearest integer)

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