This set of Environmental Engineering online quiz focuses on “Effects of Air Pollution, Design of Stack Height”.
1. Which of the following is not a part of photochemical smog?
a) NO2
b) O3
c) PAN
d) SPM
View Answer
Explanation: Photochemical smog includes NO2, O3 and PAN. The damage to vegetation is caused by NO2, O3 and PAN.
2. Which air pollutant cause corrosion of building?
a) SO2
b) SO3
c) CO
d) NO2
View Answer
Explanation: SO2 is a colorless and irritant gas that causes corrosion of building.
3. Which of the following air pollutant effects plants the most?
a) Fluorine
b) SO2
c) PAN
d) HCl
View Answer
Explanation: Fluorine is the most dangerous air pollutant that affects plant, whereas SO2, PAN and HCl effects the leaf of the plant.
4. The size of cigarette particles is ______________
a) 1μm
b) 10μm
c) <1μm
d) >10μm
View Answer
Explanation: Cigarette particles are <1μm and >25% particles are deposited in the lungs.
5. Concentration of fluorine that cause a phototoxicological effect on the plant is ___________
a) 0.1μg/m3
b) 0.3μg/m3
c) 0.5μg/m3
d) 1μg/m3
View Answer
Explanation: Fluorine is produced through aluminium or glass industries and it causes a phototoxicological effect on the plant at a concentration of 0.3μg/m3.
6. Which of the following gas is not colorless?
a) NO
b) O3
c) Pb
d) SO3
View Answer
Explanation: NO is a highly reactive gas which is reddish brown in color, whereas O3, Pb and SO3 are colorless gas.
7. The effective height of stack is given by ___________
a) Plume height / Actual height of the stack
b) Plume height * Actual height of the stack
c) Plume height – Actual height of the stack
d) Plume height + Actual height of the stack
View Answer
Explanation: Effective height of the stack, H = h1 + h2 where, h1 is the plume height and h2 is the actual height of stack.
8. The chimney is emitting particulate matter. Which of the following is the correct expression of the height of the chimney? Here ‘Kp’ represents the emission of particulate matter.
a) HC = 74 Kp0.27
b) HC = 14 Kp0.27
c) HC = 14 Kp0.47
d) HC = 74 Kp0.33
View Answer
Explanation: Height of the chimney HC = 74 Kp0.27 where HC is in metre and ‘Kp’ is in tonnes per hours.
9. What is the minimum height of the chimney in a thermal power plant of capacity 350MW?
a) 100m
b) 220m
c) 380m
d) 60m
View Answer
Explanation: As the capacity of the thermal plant lies between 200MW and 500MW, the minimum height height of the chimney is 220m.
10. Which of the following is the correct expression of the height of chimney emitting sulfur dioxide?
a) HC = 74 Kp0.27
b) HC = 14 Kp0.33
c) HC = 14 Kp0.47
d) HC = 74 Kp0.33
View Answer
Explanation: Height of the chimney, HC = 14 Kp0.33 when the chimney is emitting sulfur dioxide. Here, the unit of ‘Kp’ is in kg/hour and HC is in metre.
Sanfoundry Global Education & Learning Series – Environmental Engineering.
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