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Environmental Engineering
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Question
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.
Correct Answer
gravity separator having oil skimming devices.
Environmental Engineering problems
Search Results
1. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: 30 to 70 kV DC
2. 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)
Show Answer
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Discuss
Correct Answer: both (a) & (b)
3. TLV of ozone (O
3
) and phosgene (COCl
2
) in air is __________ ppm.
Options
A. 0.1
B. 25
C. 100
D. 1000
Show Answer
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Discuss
Correct Answer: 0.1
4. Turbidity of water is an indication of the presence of
Options
A. suspended inorganic matter
B. dissolved solids
C. floating solids
D. dissolved gases
Show Answer
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Discuss
Correct Answer: suspended inorganic matter
5. 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
Show Answer
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Discuss
Correct Answer: aerosols
6. 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
Show Answer
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Discuss
Correct Answer: hydrogen flouride
7. Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO
2
in air is __________ ppm.
Options
A. 5
B. 500
C. 1000
D. 2000
Show Answer
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Discuss
Correct Answer: 5
8. Maximum allowable concentration of CO
2
in air for safe working is __________ ppm (parts per million).
Options
A. 50
B. 1000
C. 2000
D. 5000
Show Answer
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Discuss
Correct Answer: 5000
9. 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).
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c).
10. 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
Show Answer
Scratch Pad
Discuss
Correct Answer: centrifugal force on
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