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- Question
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?
Options- A. Sedimentation tank
- B. Circular clarifier
- C. Mechanical flocculation
- D. Chemical coagulation
- Correct Answer
- Chemical coagulation
- 1. Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.
Options- A. 3
- B. 30
- C. 70
- D. 100 Discuss
- 2. Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
Options- A. asphyxiation (suffocation).
- B. shortness of breath.
- C. tuberculosis.
- D. all (a), (b) and (c). Discuss
- 3. Reingleman chart No. 2 corresponds to __________ percent black smoke.
Options- A. 10
- B. 20
- C. 40
- D. 80 Discuss
- 4. Exposure to SO2 containing chimney gases results in the
Options- A. reduction in strength of leather & cloth.
- B. acceleration of corrosion rates of metals.
- C. increased drying & hardening time of paints.
- D. all (a), (b)and(c). Discuss
- 5. Soluble silica present in boiler feed water can be removed by
Options- A. coagulation
- B. filtration
- C. anion exchanger
- D. preheating it Discuss
- 6. White smoke coming out of the chimney of a furnace indicates the use of
Options- A. low excess air.
- B. very high excess air.
- C. gaseous fuel in the furnace.
- D. liquid fuel in the furnace. Discuss
- 7. A man exposed to excessive noise level in the working environment may suffer from
Options- A. hearing loss
- B. rupture of ear drum
- C. nervousness & fatigue
- D. all (a), (b) & (c) Discuss
- 8. Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?
Options- A. CO2
- B. H2
- C. SO3
- D. N2 Discuss
- 9. Which of the following plants does not emit appreciable amount of SO2 in atmosphere?
Options- A. Thermal power plant
- B. Petroleum refinery
- C. Nitric acid plant
- D. Sulphuric acid plant Discuss
- 10. Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?
Options- A. Packed scrubber
- B. Gravity settling chamber
- C. Electrostatic precipitator
- D. Hydrocyclone Discuss
Environmental Engineering problems
Search Results
Correct Answer: 3
Correct Answer: all (a), (b) and (c).
Correct Answer: 40
Correct Answer: all (a), (b)and(c).
Correct Answer: anion exchanger
Correct Answer: very high excess air.
Correct Answer: all (a), (b) & (c)
Correct Answer: SO3
Correct Answer: Nitric acid plant
Correct Answer: Electrostatic precipitator
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