Environmental Engineering problems
- 1. Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
Options- A. biological oxidation.
- B. skimming off.
- C. settling out using chemical reagents.
- D. chlorination. Discuss
Correct Answer: settling out using chemical reagents.
- 2. Presence of soluble organics in polluted water causes
Options- A. undesirable plants growth.
- B. depletion of oxygen.
- C. fire hazards.
- D. explosion hazards. Discuss
Correct Answer: depletion of oxygen.
- 3. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan
Options- A. with greater number of blades.
- B. of increased diameter.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) & (b).
- 4. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.
Options- A. radioactive
- B. organic
- C. inorganic
- D. none of these Discuss
Correct Answer: inorganic
- 5. Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
Options- A. turbidity
- B. color (Hazen)
- C. total solids
- D. all (a), (b) & (c) Discuss
Correct Answer: all (a), (b) & (c)
- 6. COD of raw municipal sewage may be in the range of about __________ mg/litre.
Options- A. 1-2
- B. 5-10
- C. 90-120
- D. 1500-2500 Discuss
Correct Answer: 90-120
- 7. Noise level during normal conversation among men is about __________ decibles.
Options- A. 10
- B. 45
- C. 90
- D. 115 Discuss
Correct Answer: 45
- 8. Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
Options- A. coagulation and flocculation of colloids.
- B. oxidation of carbonaceous matter to CO2.
- C. nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 9. Iron & manganese present in the polluted water is removed by
Options- A. simple filtration.
- B. oxidation followed by settling & filtration.
- C. chemical coagulation.
- D. chlorination only. Discuss
Correct Answer: oxidation followed by settling & filtration.
- 10. The main industrial source of emission of hydrogen sulphide air pollutant is
Options- A. petroleum refineries.
- B. coal based thermal power plants.
- C. pulp and paper plant.
- D. metallurgical roasting & smelting plant. Discuss
Correct Answer: coal based thermal power plants.
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