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- Question
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to
Options- A. Reynold stresses
- B. shear forces
- C. both (a) & (b)
- D. neither (a) nor (b)
- Correct Answer
- both (a) & (b)
- 1. TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.
Options- A. 0.1
- B. 25
- C. 100
- D. 1000 Discuss
- 2. Turbidity of water is an indication of the presence of
Options- A. suspended inorganic matter
- B. dissolved solids
- C. floating solids
- D. dissolved gases Discuss
- 3. Particulates (< 1?m size) remaining suspended in air indefinitely and transported by wind currents are called
Options- A. fumes
- B. mists
- C. smoke
- D. aerosols Discuss
- 4. Large tonnage of refractory bricks are dried in a
Options- A. shaft furnace
- B. rotary hearth furnace
- C. tunnel kiln
- D. muffle furnace Discuss
- 5. Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
Options- A. low emissivity
- B. high thermal conductivity
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Environmental Engineering problems
Search Results
Correct Answer: 0.1
Correct Answer: suspended inorganic matter
Correct Answer: aerosols
Correct Answer: tunnel kiln
Correct Answer: both (a) and (b)
Correct Answer: 30 to 70 kV DC
Correct Answer: gravity separator having oil skimming devices.
Correct Answer: hydrogen flouride
Correct Answer: 5
Correct Answer: 5000
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