Chemical Engineering - Environmental Engineering

16. 

Smoke is produced due to

A. insufficient supply of combustion air and insufficient time for combustion.
B. poor quality of fuel and improper mixing of fuel & combustion air.
C. poor design & overloading of furnace.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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17. 

Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

A. hydrocarbons
B. hydrogen flouride
C. hydrogen sulphides
D. nitrogen dioxide

Answer: Option B

Explanation:

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18. 

Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.

A. 5
B. 500
C. 1000
D. 2000

Answer: Option A

Explanation:

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19. 

Main pollutants released from iron & steel industry is

A. CO, CO2 & SO2.
B. H2S, NO & SO3.
C. CO2, H2S & NO2.
D. SO3, NO2 & CO2.

Answer: Option A

Explanation:

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20. 

Exposure to chemicals having carcinogenic properties cause

A. dermatitis (skin disorder)
B. cancer
C. asphyxiation (suffocation)
D. asthma

Answer: Option B

Explanation:

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