Chemical Engineering - Environmental Engineering

26. 

Which of the following is the most detrimental for water used in high pressure boiler ?

A. Silica
B. Turbidity
C. Phenol
D. Dissolved oxygen

Answer: Option A

Explanation:

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27. 

Turbidity of water is an indication of the presence of

A. suspended inorganic matter
B. dissolved solids
C. floating solids
D. dissolved gases

Answer: Option A

Explanation:

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28. 

Presence of excess flourine in water causes

A. dental cavity
B. tooth decay
C. fluorosis
D. respiratory disease

Answer: Option C

Explanation:

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29. 

Siderosis is a disease caused by the inhalation of __________ dust.

A. coal
B. silica
C. iron
D. none of these

Answer: Option C

Explanation:

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30. 

Which of the following pollutants is not emitted during volcanic eruptions ?

A. SO2
B. H2S
C. CO
D. hydrocarbons

Answer: Option D

Explanation:

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