Category: Environmental Engineering

A. 24 – 48 hours
B. 10-12 days
C. 2-3 months
D. 1-2 year

A. maximum at noon
B. minimum at noon
C. maximum at midnight
D. same throughout the day

A. 10 to 25
B. 50
C. 75
D. 100

A. sludge digestion
B. sludge disposal
C. sedimentation
D. filtration

A. maximum flow only
B. minimum flow only
C. average flow only
D. maximum and minimum flow

A. at a distance R from the well
B. close to the well
C. at a distance R/2 from the well
D. none of the above
where R is the radius of influence

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. lesser value
B. higher value
C. same value
D. accurate value

A. is economical than circular section
B. provides self cleansing velocity at low discharges
C. is more stable than circular section
D. is easy to construct

A. oxidation pond
B. oxidation ditch
C. aerated lagoons
D. trickling filters