A. prechlorination
B. post chlorination
C. super chlorination
D. break point chlorination
Related Mcqs:
- In chlorination, with the rise in temperature of water, death rate of bacteria____________?
A. increases
B. decreases
C. remains unaffected
D. none of the above - As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is___________________?
A. smaller
B. larger
C. same
D. none of the above - Laying of sewers is usually done with the help of________________?
A. a theodolite
B. a compass
C. sight rails and boning rods
D. a plane table - Cleaning is done by________________?
1) scraping and removal in filters slow sand
2) back washing in slow sand filters
3) scraping and removal in filters rapid sand
4) back washing in rapid sand filters
The correct answer isA. (1) and (2)
B. (2) and (3)
C. (1) and (4)
D. (2) and (4) - Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about_______________?
A. 10 to 25
B. 50
C. 75
D. 100 - The major disadvantage of lime soda process of water softening is that_________________?
A. it is unsuitable for turbid and acidic water
B. huge amount of precipitate is formed which creates a disposal problem
C. the effluent cannot be reduced to zero hardness
D. it is unsuitable for softening the water of excessive hardness - The process of lagooning is primarily a means of________________?
A. reducing the excessive flow in sewers
B. disposing of sludge
C. increasing the capacity of storage re-servoirs
D. increasing flow of sewage through imhoff tanks - The means of access for inspection and cleaning of sewer line is known as_______________?
A. inlet
B. manhole
C. drop manhole
D. catch basin - The treatment of water with bleaching powder is known as________________?
A. prechlorination
B. super chlorination
C. dechlorination
D. hypochlorination - Alum as a coagulant is found to be most effective when pH range of water is______________?
A. 2 to 4
B. 4 to 6
C. 6 to 8
D. 8 to 10
