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- Question
Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
Options- A. reduce SO2 content in
- B. catalytically convert SO2 to SO3 in
- C. increase the dew point of
- D. none of these.
- Correct Answer
- reduce SO2 content in
- 1. Solid content in most of the domestic sewage is about __________ percent.
Options- A. 0.001
- B. 0.1
- C. 5
- D. 10 Discuss
- 2. Most of the bacteria in sewage are
Options- A. parasitic
- B. saprophytic
- C. anerobic
- D. none of these Discuss
- 3. Presence of iron and manganese in water causes
Options- A. reduction in its dissolved oxygen content.
- B. discoloration of bathroom fixtures.
- C. temporary hardness.
- D. none of these. Discuss
- 4. In the context of the chemical process industries, the term BOD is normally associated with the
Options- A. characterisation of solid wastes.
- B. organic concentration in gaseous effluents.
- C. characterisation of liquid effluents.
- D. characterisation of boiler feed water. Discuss
- 5. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
Options- A. cancer
- B. silicosis
- C. respiratory disease (e.g., asthma)
- D. reduced crop yield Discuss
- 6. Which of the following industries discharge mercury as a pollutant?
Options- A. Chloro-alkali industry
- B. Tanneries
- C. Beverage plant
- D. Phosphoric acid plant Discuss
- 7. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by
Options- A. chemical coagulation
- B. floatation & skimming
- C. centrifugation
- D. ultrafiltration Discuss
- 8. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
Options- A. 1
- B. 5
- C. 50
- D. 500 Discuss
- 9. The function of skimming tank in sewage treatment is to remove __________ substances.
Options- A. dissolved solid
- B. suspended solid
- C. oil & fatty
- D. gritty & inorganic Discuss
- 10. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes
Options- A. paralysis of muscles & loss of appetite.
- B. nervous depression.
- C. gastritis & diarrhea.
- D. all (a), (b) and (c). Discuss
Environmental Engineering problems
Search Results
Correct Answer: 0.1
Correct Answer: saprophytic
Correct Answer: discoloration of bathroom fixtures.
Correct Answer: characterisation of liquid effluents.
Correct Answer: cancer
Correct Answer: Chloro-alkali industry
Correct Answer: chemical coagulation
Correct Answer: 5
Correct Answer: oil & fatty
Correct Answer: all (a), (b) and (c).
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