Chemical Engineering - Environmental Engineering

11. 

During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?

A. Idle running
B. Acceleration
C. Cruising
D. Deaccelaration

Answer: Option A

Explanation:

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12. 

H2S present in gaseous stream can be removed by adsorption on

A. silica gel
B. active carbon
C. bog iron
D. limestone powder

Answer: Option C

Explanation:

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13. 

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

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

Answer: Option D

Explanation:

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14. 

Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

A. natural aeration of water stream.
B. photosynthetic action of algae.
C. both (a) & (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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15. 

Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to

A. Reynold stresses
B. shear forces
C. both (a) & (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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