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- Question
Corrosion in boilers can be prevented by
Options- A. deaeration of feed water.
- B. enhancing pH of feed water by adding alkali.
- C. feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. The main type of sludge gas evolved during sewage treatment in Imhoff tank is
Options- A. CO2
- B. CH4
- C. CO
- D. H2 Discuss
- 2. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
Options- A. Mercury
- B. Arsenic
- C. Aluminium
- D. Lead Discuss
- 3. Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?
Options- A. Active carbon
- B. Silica gel
- C. Bog iron (iron oxide)
- D. Pulverised limestone Discuss
- 4. Threshold limit value (TLV) of CO in air is __________ ppm.
Options- A. 5
- B. 50
- C. 2000
- D. 5000 Discuss
- 5. Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.
Options- A. 100
- B. 1000
- C. 400
- D. 4000 Discuss
- 6. Biological oxidation ponds remove organic matters present in the polluted water by
Options- A. using the activities of bacteria and other micro organisms.
- B. aerobic oxidation.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 7. Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
Options- A. phosgene
- B. bromine
- C. MIC (methyl iso-cynate)
- D. ozone Discuss
- 8. Reinglemann chart is used for the measurement of the
Options- A. combustibles present in automobile exhaust.
- B. smoke density from a chimey.
- C. exhaust gas density.
- D. flue gas temperature. Discuss
- 9. Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?
Options- A. Thermosphere
- B. Troposphere
- C. Stratosphere
- D. none of these Discuss
- 10. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
Options- A. ionosphere
- B. troposphere
- C. stratosphere
- D. none of these Discuss
Environmental Engineering problems
Search Results
Correct Answer: CH4
Correct Answer: Aluminium
Correct Answer: Silica gel
Correct Answer: 50
Correct Answer: 1000
Correct Answer: both (a) & (b).
Correct Answer: MIC (methyl iso-cynate)
Correct Answer: smoke density from a chimey.
Correct Answer: Troposphere
Correct Answer: troposphere
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