A. to increase the filtration slow sand filters capacity of
B. to increase the filtration rapid sand filters capacity of
C. for isolated buildings like pools, hotels etc swimming
D. all of the above
Related Mcqs:
- The rate of filtration in slow sand filters in million litres per day per hectare is about_____________?
A. 50 to 60
B. 100 to 150
C. 500 to 600
D. 1400 to 1500 - If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to________________?
A. total alkalinity
B. total hardness
C. total hardness – total alkalinity
D. non carbonate hardness - Activated carbon is used for_____________?
A. disinfection
B. removing hardness
C. removing odours
D. removing corrosiveness - The minimum and maximum diameters of sewers shall preferably be_________________?
A. 15 cm and 100 cm
B. 15 cm and 300 cm
C. 30 cm and 450 cm
D. 60 cm and 300cm - Composting and lagooning are the methods of_______________?
A. sludge digestion
B. sludge disposal
C. sedimentation
D. filtration - The working conditions in imhoff tanks are_______________?
A. aerobic only
B. anaerobic only
C. aerobic in lower compartment and anaerobic in upper compartment
D. anaerobic in lower compartment and aerobic in upper compartment - The slope of sewer shall be__________________?
A. given in the direction of natural slope of ground
B. given in the direction opposite to natural slope of ground
C. zero
D. steeper than 1 in 20 - In lime-soda process________________?
A. only carbonate hardness is removed
B. only non-carbonate hardness is re-moved
C. lime reduces the carbonate hardness and soda-ash removes the non-carbo¬nate hardness
D. lime reduces the non-carbonate hard-ness and soda-ash removes the carbo¬nate hardness - The settling velocity of a particle in a sedimentation tank increases if_________________?
A. particle size is decreased
B. the surface area of tank is increased
C. the depth of tank is decreased
D. none of the above - As compared to geometrical increase method of forecasting population, arithmetical increase method gives________________?
A. lesser value
B. higher value
C. same value
D. accurate value
