Engineering :: Environmental Engineering
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1. |
The chemical most commonly used to speed sedimentation of sewage is |
A. |
sulphuric acid |
B. |
copper sulphate |
C. |
lime |
D. |
sodium ermanganate |
Answer: Option C
Explanation:
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2. |
The gas from sludge digestion tanks is mainly composed of |
A. |
nitrogen |
B. |
hydrogen sulphide |
C. |
methane |
D. |
carbon monoxide |
Answer: Option C
Explanation:
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3. |
The quantity of chlorine in ppm required to satisfactorily chlorinate sewage is usually |
Answer: Option D
Explanation:
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4. |
Most of the bacteria in sewage are |
A. |
pathogenic |
B. |
anaerobic |
C. |
saprophytic |
D. |
parasitic |
Answer: Option C
Explanation:
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5. |
The ratio of oxygen available to the oxygen required for stabilization of sewage is called |
A. |
biochemical oxygen demand |
B. |
relative stability |
C. |
bacterial-stability factor |
D. |
oxygen-ion concentration |
Answer: Option B
Explanation:
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6. |
In the design of grit chambers |
A. |
temperature is an important factor |
B. |
the maximum velocity of flow is 1 ft/s |
C. |
the detention period should be at least 30 min |
D. |
there should be a 5 to 1 ration of length to depth |
Answer: Option B
Explanation:
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7. |
The process of lagooning is primarily a means of |
A. |
increasing the capacity of storage reservoirs |
B. |
increasing flow of sewage through Imhoff tanks |
C. |
reducting the excessive flow in sewers |
D. |
disposing sludge |
Answer: Option D
Explanation:
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8. |
The biochemical treatment of sewage effluents is essentially a process of |
A. |
reduction |
B. |
oxidation |
C. |
dehydration |
D. |
alkalinization |
Answer: Option B
Explanation:
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9. |
In treating turbine water a popular coagulant is |
A. |
calcium sulphate |
B. |
chlorine |
C. |
ferric sulphate |
D. |
iodine |
Answer: Option C
Explanation:
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10. |
Septic tanks are primarily used for |
A. |
the aerobic decomposition of deposited sweage solids |
B. |
separation of deposited solids |
C. |
anaerobic decomposition of deposited solids |
D. |
separation of oil and grease scums. |
Answer: Option C
Explanation:
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