Chemical Engineering - Environmental Engineering

36. 

Ionisation potential employed in the industrial electrostatic precipitator is of the order of

A. 30 to 70 kV DC
B. 30 to 70 kV AC
C. 230 V AC
D. 230 V DC

Answer: Option A

Explanation:

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37. 

The widest explosive limit is of __________ , thereby making it the most explosive gas.

A. acetylene
B. petrol vapor
C. hydrogen
D. carbon monoxide

Answer: Option A

Explanation:

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38. 

Aerobic biological oxidation ponds used for the purification of polluted water

A. destroys/removes pathogen from the sewage.
B. is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents.
C. destroys/removes pathogen much more effectively if the sewage is chlorinated.
D. all (a), (b) & (c).

Answer: Option D

Explanation:

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39. 

Polluted water having low BOD are most economically treated in

A. sedimentation tanks
B. oxidation ponds
C. sludge digester
D. clarifier

Answer: Option B

Explanation:

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40. 

Tri-sodium phosphate is used in boiler water treatment to reduce

A. turbidity
B. caustic embrittlement
C. suspended silica
D. dissolved oxygen

Answer: Option B

Explanation:

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