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- Question
Presence of soluble organics in polluted water causes
Options- A. undesirable plants growth.
- B. depletion of oxygen.
- C. fire hazards.
- D. explosion hazards.
- Correct Answer
- depletion of oxygen.
- 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
- 2. Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.
Options- A. moderately
- B. highly
- C. extremely
- D. very extremely Discuss
- 3. Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the
Options- A. gravity settling chamber
- B. cyclone separator
- C. electrostatic precipitator
- D. bag filter Discuss
- 4. Presence of __________ hardness is responsible for the temporary hardness in water.
Options- A. carbonate
- B. calcium
- C. choride
- D. sulphate Discuss
- 5. Foul odour and bad taste of water is removed by treating with
Options- A. alum
- B. bleaching powder
- C. activated carbon
- D. copper sulphate. Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. Noise level during normal conversation among men is about __________ decibles.
Options- A. 10
- B. 45
- C. 90
- D. 115 Discuss
Environmental Engineering problems
Search Results
Correct Answer: settling out using chemical reagents.
Correct Answer: very extremely
Correct Answer: electrostatic precipitator
Correct Answer: calcium
Correct Answer: activated carbon
Correct Answer: both (a) & (b).
Correct Answer: inorganic
Correct Answer: all (a), (b) & (c)
Correct Answer: 90-120
Correct Answer: 45
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