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- Question
Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?
Options- A. Dust catcher (gravity type)
- B. Cyclone separator
- C. Bag filter
- D. Hollow wet scrubber
- Correct Answer
- Dust catcher (gravity type)
- 1. Main pollutants released from iron & steel industry is
Options- A. CO, CO2 & SO2.
- B. H2S, NO & SO3.
- C. CO2, H2S & NO2.
- D. SO3, NO2 & CO2. Discuss
- 2. Smoke is produced due to
Options- A. insufficient supply of combustion air and insufficient time for combustion.
- B. poor quality of fuel and improper mixing of fuel & combustion air.
- C. poor design & overloading of furnace.
- D. all (a), (b) and (c). Discuss
- 3. TLV of mercury in potable (drinking) water is about __________ ppm.
Options- A. 0.001
- B. 0.1
- C. 1
- D. 5 Discuss
- 4. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
Options- A. 120
- B. 140
- C. 170
- D. 200 Discuss
- 5. The commonest form of iron & manganese found in ground water as pollutant is in the form of their
Options- A. carbonates
- B. bi-carbonates
- C. chlorides
- D. sulphides Discuss
- 6. Siderosis is a disease caused by the inhalation of __________ dust.
Options- A. coal
- B. silica
- C. iron
- D. none of these Discuss
- 7. Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?
Options- A. Lagooning
- B. Activated carbon adsorption
- C. Biological oxidation pond
- D. Chemical coagulation Discuss
- 8. Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
Options- A. biological oxygen pond.
- B. radial settling tank (thickener) using coagulant (lime & ferrous sulphate).
- C. lagoons.
- D. filtration. Discuss
- 9. Presence of excess flourine in water causes
Options- A. dental cavity
- B. tooth decay
- C. fluorosis
- D. respiratory disease Discuss
- 10. The widest explosive limit is of __________ , thereby making it the most explosive gas.
Options- A. acetylene
- B. petrol vapor
- C. hydrogen
- D. carbon monoxide Discuss
Environmental Engineering problems
Search Results
Correct Answer: CO, CO2 & SO2.
Correct Answer: all (a), (b) and (c).
Correct Answer: 0.001
Correct Answer: 170
Correct Answer: bi-carbonates
Correct Answer: iron
Correct Answer: Activated carbon adsorption
Correct Answer: radial settling tank (thickener) using coagulant (lime & ferrous sulphate).
Correct Answer: fluorosis
Correct Answer: acetylene
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