Hard water for public water supply is discarded because
Gravity conduits for carrying water from the source are
Rapid gravity filter can only remove turbidity of water upto
E. Coli bacterias die in water having pH greater than
The main disadvantage of hard water, is
Surface water is obtained from
Pick up the correct statement from the following regarding radial flow centrifugal pumps :
Continuous flow of water can be expected from
Pick up the correct statement from the following :
Check valves are installed
An area is declared drought affected if its mean rainfall is less than
Hardness of water is caused due to
Quality of water is said to be good if it is
The maximum hourly consumption, is generally taken as
The best process of disinfection of public water supply, is by
The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydro-chloric acid forhours, more than
Flow through period, in sedimentation tanks, is
Pick up the incorrect statement from the following :
A city supply includes
If discharge of a pump is 0.cumecs, the economic diameter of pipe, is
Normal values of overflow rate for plain sedimentation tank, is
The main draw-back of centrifugal pump, is
If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in square kilometres is A, the total run-off Q, is given by
Mud balls may be removed by
For estimating the run off of catchments, the mean value of the constant 'K' in the Khosla's formula Qy = Py - K (1.8 Ty +is
The maximum pressure to which cast iron pipes may be subjected to, is
For maximum alkalinity of water, pH value should be
Service connections to consumers houses, are generally provided with
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