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- Question
Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes
Options- A. blood poisoning.
- B. anaemia.
- C. nervous system disorder.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).
Options- A. 50
- B. 1000
- C. 2000
- D. 5000 Discuss
- 2. Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.
Options- A. 5
- B. 500
- C. 1000
- D. 2000 Discuss
- 3. Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
Options- A. hydrocarbons
- B. hydrogen flouride
- C. hydrogen sulphides
- D. nitrogen dioxide Discuss
- 4. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
Options- A. biological oxygen pond.
- B. aerated lagoons.
- C. trickling filters.
- D. gravity separator having oil skimming devices. Discuss
- 5. Ionisation potential employed in the industrial electrostatic precipitator is of the order of
Options- A. 30 to 70 kV DC
- B. 30 to 70 kV AC
- C. 230 V AC
- D. 230 V DC Discuss
- 6. Operating principle of cyclone separator is based on the action of __________ dust particles.
Options- A. diffusion of
- B. centrifugal force on
- C. gravitational force on
- D. electrostatic force on Discuss
- 7. Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal
Options- A. by chemical coagulation.
- B. in sedimentation tanks equipped with mechanical scrapper.
- C. in vacuum filter.
- D. in clarifiers. Discuss
- 8. The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the
Options- A. bacterial stability factor.
- B. relative stability.
- C. biological oxygen demand (BOD).
- D. oxygen ion concentration. Discuss
- 9. Scale formation in boiler is controlled by
Options- A. preheating of feed water.
- B. reduction in hardness, silica & alumina in feed water.
- C. keeping the pH value of feed water just below 7.
- D. eliminating H2S in feed water. Discuss
- 10. Most of the atmospheric air pollutants are present in large quantity in
Options- A. stratosphere
- B. thermosphere
- C. trophosphere
- D. mesosphere Discuss
Environmental Engineering problems
Search Results
Correct Answer: 5000
Correct Answer: 5
Correct Answer: hydrogen flouride
Correct Answer: gravity separator having oil skimming devices.
Correct Answer: 30 to 70 kV DC
Correct Answer: centrifugal force on
Correct Answer: in sedimentation tanks equipped with mechanical scrapper.
Correct Answer: relative stability.
Correct Answer: reduction in hardness, silica & alumina in feed water.
Correct Answer: trophosphere
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