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  • Question
  • 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

  • Correct Answer
  • Silica 


  • Environmental Engineering problems


    Search Results


    • 1. Tolerable limit of nitrogen oxides in air is __________ ppm.

    • Options
    • A. 0.1
    • B. 1
    • C. 5
    • D. 25
    • Discuss
    • 2. 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
    • 3. Dust collection efficiency of a cyclone separator depends upon its

    • Options
    • A. diameter.
    • B. inlet gas velocity.
    • C. overall height.
    • D. all (a), (b) & (c).
    • Discuss
    • 4. Polluted water having low BOD are most economically treated in

    • Options
    • A. sedimentation tanks
    • B. oxidation ponds
    • C. sludge digester
    • D. clarifier
    • Discuss
    • 5. Aerobic biological oxidation ponds used for the purification of polluted water

    • Options
    • A. destroys/removes pathogen from the sewage.
    • B. is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents.
    • C. destroys/removes pathogen much more effectively if the sewage is chlorinated.
    • D. all (a), (b) & (c).
    • Discuss
    • 6. Which is a secondary air pollutant?

    • Options
    • A. Photochemical smog
    • B. Sulphur dioxide
    • C. Nitrogen dioxide
    • D. Dust particles
    • Discuss
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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