Chemical Engineering - Environmental Engineering

41. 

The commonest form of iron & manganese found in ground water as pollutant is in the form of their

A. carbonates
B. bi-carbonates
C. chlorides
D. sulphides

Answer: Option B

Explanation:

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42. 

80% less than 200 mesh size particles are called

A. smoke
B. powder
C. grit
D. aggregates

Answer: Option B

Explanation:

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43. 

Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

A. by chemical coagulation.
B. in sedimentation tanks equipped with mechanical scrapper.
C. in vacuum filter.
D. in clarifiers.

Answer: Option B

Explanation:

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44. 

Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes

A. blood poisoning.
B. anaemia.
C. nervous system disorder.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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45. 

TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.

A. 0.1
B. 25
C. 100
D. 1000

Answer: Option A

Explanation:

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