Environmental Engineering Mcqs
This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Environmental Engineering ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Environmental Engineering Mcqs comprehensively.
2. The gas from sludge digestion tanks is mainly composed of
Nitrogen
Hydrogen sulphide
Methane
Carbon monoxide
3. The quantity of chlorine in ppm required to satisfactorily chlorinate sewage is usually
125-150
95-120
60-90
0-25
4. Most of the bacteria in sewage are
Pathogenic
Anaerobic
Saprophytic
Parasitic
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5. The ratio of oxygen available to the oxygen required for stabilization of sewage is called
Biochemical oxygen demand
Relative stability
Bacterial-stability factor
Oxygen-ion concentration
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6. In the design of grit chambers
Temperature is an important factor
The maximum velocity of flow is 1 ft/s
The detention period should be at least 30 min
There should be a 5 to 1 ration of length to depth
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7. The process of lagooning is primarily a means of
Increasing the capacity of storage reservoirs
Increasing flow of sewage through Imhoff tanks
Reducting the excessive flow in sewers
Disposing sludge
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8. The biochemical treatment of sewage effluents is essentially a process of
Reduction
Oxidation
Dehydration
Alkalinization
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9. In treating turbine water a popular coagulant is
Calcium sulphate
Chlorine
Ferric sulphate
Iodine
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10. Septic tanks are primarily used for
The aerobic decomposition of deposited sweage solids
Separation of deposited solids
Anaerobic decomposition of deposited solids
Separation of oil and grease scums.
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11. The per cent of total solids in most domestic sewage is approximately
0.01
0.1
1
10
12. For protection of acquatic life in a fresh water stream sewage effluent should never lower the dissolved oxygen content lower than
15 ppm
10 ppm
5 ppm
20 ppm
13. Ecological system or ecosystem refers to
A group of individuals of any one kind of organism
All of the population occupying a given area
The community and non-living environment working together
A portion of the earth where living objects can be found
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14. Chloramines are used in water treatment
For disinfection
For taste and colour control
As algicides
For weed control in reservoirs
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15. The most efficient equipment for removal of sub micron dust particles from blast furnace gas is
Venturi scrubber
Gravity settling chamber
Electrostatic precipitator
Cyclone separator
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