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
Sewerage system is designed for_______________?
(A) maximum flow only
(B) minimum flow only
(C) average flow only
(D) maximum and minimum flow
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 detention period for oxidation ponds is usually kept as______________?
(A) 4-8 hours
(B) 24 hours
(C) 10 to 15 days
(D) 3 months
The main disadvantage of oxidation pond is that________________?
(A) large area is required for construction
(B) maintenance and operation cost are high
(C) BO
(D) removal is very low
Sludge volume index is defined as the ratio of_______________?
(A) percentage of sludge by volume to percentage of suspended solids by weight
(B) percentage of sludge by volume to percentage of total solids by weight
(C) percentage of suspended solids by weight to percentage of sludge by volume
(D) percentage of total solids by weight to percentage of sludge by volume
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?
(A) waste pipe
(B) soil pipe
(C) vent pipe
(D) antisiphonage pipe
Most of the bacteria in sewage are______________?
(A) parasitic
(B) saprophytic
(C) pathogenic
(D) anaerobic
A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?
(A) vent pipe
(B) antisiphonage pipe
(C) waste pipe
(D) soil pipe
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