Discussion
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- Question
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.
- Correct Answer
- its dissolved oxygen content.
- 1. 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
- 2. 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
- 3. Noise level in a quiet private business office is about __________ decibels.
Options- A. 25
- B. 50
- C. 70
- D. 85 Discuss
- 4. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
Options- A. CO
- B. SO2
- C. NOx
- D. CFC (chloro fluoro carbons) Discuss
- 5. Carcinogenic air pollutants cause
Options- A. bone decay
- B. cancer
- C. asphyxiation (suffocation)
- D. anemia Discuss
- 6. The common pollutant generated in chlor-alkali industry and battery manufacture is
Options- A. mercury
- B. brine
- C. phosphate
- D. none of these Discuss
- 7. 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
- 8. Soluble silica present in boiler feed water can be removed by
Options- A. coagulation
- B. filtration
- C. anion exchanger
- D. preheating it Discuss
- 9. 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
- 10. Reingleman chart No. 2 corresponds to __________ percent black smoke.
Options- A. 10
- B. 20
- C. 40
- D. 80 Discuss
Environmental Engineering problems
Search Results
Correct Answer: dissolved oxygen content
Correct Answer: septic tank
Correct Answer: 50
Correct Answer: CO
Correct Answer: cancer
Correct Answer: mercury
Correct Answer: Carbon monoxide
Correct Answer: anion exchanger
Correct Answer: all (a), (b)and(c).
Correct Answer: 40
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