Lagooning process is mainly a means of the__________________?

Related Mcqs:

1. Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________?

   A. Gravity settling chamber
   B. Cyclone separator
   C. Electrostatic precipitator
   D. Bag filter

2. Exposure to SO2 containing chimney gases results in the__________________?

   A. Reduction in strength of leather & cloth
   B. Acceleration of corrosion rates of metals
   C. Increased drying & hardening time of paints
   D. All A., B. and C.

3. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of________________?

   A. CO2
   B. SO2
   C. Hydrocarbons
   D. CFC (chloro fluoro carbon)

4. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?

   A. With greater number of blades
   B. Of increased diameter
   C. Both A. & B.
   D. Neither A. nor B.

5. The progressive warming up of the earth’s surface is mainly due to the___________________?

   A. Automobile exhaust
   B. Blanketing effect of CO2 in the atmosphere
   C. De-forestation
   D. Thickening of ozone layer

6. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?

   A. Radioactive
   B. Organic
   C. Inorganic
   D. None of these

7. Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?

   A. 0.002
   B. 0.2
   C. 1.2
   D. 4.8

8. In the context of the chemical process industries, the term BOD is normally associated with the_____________________?

   A. Characterisation of solid wastes
   B. Organic concentration in gaseous effluents
   C. Characterisation of liquid effluents
   D. Characterisation of boiler feed water

9. Infective bacteria in water is killed by the _____________ process?

   A. Sterilisation
   B. Aeration
   C. Disinfection
   D. None of these

10. In water treatment, alum [Al2(SO4)3] is used for the process of __________________?

    A. Filtration
    B. Coagulation
    C. Sedimentation
    D. Disinfection