Chemical Engineering - Environmental Engineering

21. 

Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for

A. conversion of CO into CO2 in the second compartment.
B. conversion of NOx into N2 and NH3 in the first compartment.
C. oxidation of unburnt hydrocarbon fuel in the second compartment.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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22. 

Lagooning process is mainly a means of the

A. sludge disposal.
B. reduction of excessive flow in sewers.
C. biological treatment of wastes.
D. none of these.

Answer: Option A

Explanation:

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23. 

Carbon monoxide is a pollutant, which causes

A. respiratory disease (e.g. asthma).
B. asphyxiation (suffocation) leading to death.
C. retardation in crop growth.
D. damage to building materials like marble.

Answer: Option B

Explanation:

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24. 

Pollution by particulate matter emission in the atmosphere does not take place during metal

A. grinding
B. machining
C. cutting
D. polishing

Answer: Option D

Explanation:

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25. 

Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as

A. photochemical smog.
B. peroxy acetyl nitrate (PAN) or methyl nitrile.
C. benzopyrene.
D. poly acrylonitrile

Answer: Option B

Explanation:

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