Environmental Engineering problems
- 1. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called
Options- A. cesspool
- B. lagoon
- C. skimming mill
- D. septic tank Discuss
Correct Answer: septic tank
- 2. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.
Options- A. dissolved oxygen content
- B. biological oxygen demand
- C. vapor pressure
- D. all (a), (b) and (c) Discuss
Correct Answer: dissolved oxygen content
- 3. Deaeration of high pressure boiler feed water is done to reduce
Options- A. foaming from boilers.
- B. its dissolved oxygen content.
- C. its silica content.
- D. caustic embrittlement. Discuss
Correct Answer: its dissolved oxygen content.
- 4. The common pollutant generated in chlor-alkali industry and battery manufacture is
Options- A. mercury
- B. brine
- C. phosphate
- D. none of these Discuss
Correct Answer: mercury
- 5. Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?
Options- A. Smog & ozone
- B. Hydrogen fluoride & nitrogen oxides
- C. Sulphur dioxide & spray of weed killers
- D. Carbon monoxide Discuss
Correct Answer: Carbon monoxide
- 6. Soluble silica present in boiler feed water can be removed by
Options- A. coagulation
- B. filtration
- C. anion exchanger
- D. preheating it Discuss
Correct Answer: anion exchanger
- 7. 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
Correct Answer: all (a), (b)and(c).
- 8. Reingleman chart No. 2 corresponds to __________ percent black smoke.
Options- A. 10
- B. 20
- C. 40
- D. 80 Discuss
Correct Answer: 40
- 9. 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
Correct Answer: all (a), (b) and (c).
- 10. 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
Correct Answer: 3
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