Environmental Engineering

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

A. 500 to 750 litres/hour/ m2
B. 1000 to 1250 litres/hour/ m2
C. 1250 to 1500 litres/hour/m2
D. 1500 to 2000 litres/hour/m2

A. depth of tank
B. surface area of tank
C. both depth and surface area of tank
D. none of the above

A. increasing the depth of tank
B. decreasing the depth of tank
C. increasing the surface area of tank
D. decreasing the surface area of tank

1) increase in turbidity of water
2) decrease in turbidity of water
3) increase in temperature of water
4) decrease in temperature of water
The correct answer is?

A. (1) and (2)
B. (1)and (4)
C. (2) and (3)
D. (2) and (4)

A. 1 to 2 minutes
B. 30 to 45 minutes
C. 2 to 6 hours
D. 2 to 6 days

A. sulphuric acid
B. copper sulphate
C. lime
D. sodium permanganate

A. 50 to 60
B. 100 to 150
C. 500 to 600
D. 1400 to 1500

1) slower filtration rate
2) higher filtration rate
3) lesser efficiency in removal of bacteria
4) higher efficiency in removal of bacteria
The correct answer is?

A. (1) and (2)
B. (2) and (3)
C. (1) and (4)
D. (2) and (4)

A. excessive negative head
B. mud ball formation
C. higher turbidity in the effluent
D. low temperature