Chemical Engineering - Environmental Engineering

16. 

High noise level in a chemical plant can be controlled by the

A. suppression of noise at the source itself.
B. path control of noise.
C. protection of operating personnel.
D. all (a), (b) & (c).

Answer: Option D

Explanation:

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17. 

Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.

A. reduce SO2 content in
B. catalytically convert SO2 to SO3 in
C. increase the dew point of
D. none of these.

Answer: Option A

Explanation:

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18. 

Main pollutants released from petroleum refineries is

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

Answer: Option A

Explanation:

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19. 

Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

A. 35
B. 75
C. 95
D. 105

Answer: Option B

Explanation:

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20. 

Which of the following is a green house gas other than CO2 ?

A. Methane
B. Nitrous oxide
C. Chlorofluro carbons (CFC)
D. All (a), (b) and (c)

Answer: Option D

Explanation:

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