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.Management Sciences
Category: Environmental Engineering
The maximum discharge of a tube-well is about_________________?
A. 5 litres/sec
B. 50 litres/sec
C. 500 litres/sec
D. 1000 litres/see
As compared to cast iron pipes, steel pipes are______________?
A. heavier
B. stronger
C. costlier
D. less susceptible to corrosion
The most commonly used sewer under culverts is_______________?
A. circular brick sewer
B. circular cast iron sewer
C. semi-elliptical sewer
D. horse-shoe type sewer
The time of concentration is defined as_______________?
A. the time taken by rainfall water to run from most distant point of water shed to the inlet of sewer
B. the time required for flow of water in sewer to the point under consideration
C. sum of (A) and (B)
D. difference of (A) and (B)
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
Activated carbon is used for_____________?
A. disinfection
B. removing hardness
C. removing odours
D. removing corrosiveness
If the average daily consumption of a city is 100,000 m3, the maximum daily con¬sumption on peak hourly demand will be_______________?
A. 100000m3
B. 150000m3
C. 180000m3
D. 270000 m3
The alum, when added as a coagulant in water_______________?
A. does not require alkalinity in water for flocculation
B. does not affect pH value of water
C. increases pH value of water
D. decreases pH value of water
The maximum permissible limit for flouride in drinking water is______________?
A. 0.1 mg/litre
B. 1.5 mg/litre
C. 5 mg/litre
D. 10 mg/litre
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally_______________?
A. less and more
B. less and less
C. more and less
D. more and more
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