logo

CuriousTab

CuriousTab

Discussion


Home Chemical Engineering Environmental Engineering Comments

  • 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
    • Discuss
    • 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)
    • Discuss
    • 3. TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.

    • Options
    • A. 0.1
    • B. 25
    • C. 100
    • D. 1000
    • Discuss
    • 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
    • Discuss
    • 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
    • Discuss
    • 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
    • Discuss
    • 7. 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
    • 8. 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
    • 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).
    • Discuss
    • 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
    • Discuss


    Comments

    There are no comments.

Enter a new Comment