Environmental Engineering problems
- 1. Pick out the wrong statement.
Options- A. Caustic embrittlement of boiler's metallic parts is caused by high concentration of caustic soda in boiler feed water.
- B. Cooling and freezing of water kills the bacteria present in it.
- C. With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing.
- D. Dissolved oxygen content in high pressure boiler feed water should be nil. Discuss
Correct Answer: Cooling and freezing of water kills the bacteria present in it.
- 2. Tolerable limit of nitrogen oxides in air is __________ ppm.
Options- A. 0.1
- B. 1
- C. 5
- D. 25 Discuss
Correct Answer: 5
- 3. Which of the following is the most detrimental for water used in high pressure boiler?
Options- A. Silica
- B. Turbidity
- C. Phenol
- D. Dissolved oxygen Discuss
Correct Answer: Silica
- 4. Which is a secondary air pollutant?
Options- A. Photochemical smog
- B. Sulphur dioxide
- C. Nitrogen dioxide
- D. Dust particles Discuss
Correct Answer: Photochemical smog
- 5. Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
Options- A. inversely proportional to viscosity of gas.
- B. proportional to the viscosity & density of the gas.
- C. proportional to the pressure of the gas.
- D. both (b) and (c). Discuss
Correct Answer: both (b) and (c).
- 6. Persons working in cement plants and limestone quarries are more prone to disease like
Options- A. cancer
- B. asthma
- C. silicosis
- D. flourosis (bone disease) Discuss
Correct Answer: silicosis
- 7. Pick out the wrong statement.
Options- A. The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone.
- B. Mesosphere is characterised by very low atmospheric pressure and low temperature.
- C. Troposhere is a dusty zone containing water vapor and clouds.
- D. The radio waves used in the long distance radio communication are reflected back to earth by stratosphere. Discuss
Correct Answer: The radio waves used in the long distance radio communication are reflected back to earth by stratosphere.
- 8. Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?
Options- A. NOx
- B. Hg
- C. SO2
- D. F Discuss
Correct Answer: SO2
- 9. In water chemical treatment plant, use of chloramines ensures
Options- A. disinfection.
- B. taste & odour control.
- C. weed control in reservoirs.
- D. removal of permanent hardness. Discuss
Correct Answer: disinfection.
- 10. 80% less than 200 mesh size particles are called
Options- A. smoke
- B. powder
- C. grit
- D. aggregates Discuss
Correct Answer: powder
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