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.Management Sciences
Category: Environmental Engineering
If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is_____________?
1) presumptive coliform test
2) confirmed coliform test
3) completed coliform test
The correct answer is ?
A. only (1)
B. both (1) and (2)
C. both (1) and (3)
D. all (1), (2) and (3)
Most suitable section of sewer in separate sewage system is________________?
A. rectangular section
B. circular section
C. standard form of egg shaped sewer
D. modified egg shaped section
The effective size of sand particles used in slow sand filters is_______________?
A. 0.25 to 0.35 mm
B. 0.35 to 0.60 mm
C. 0.60 to 1.00 mm
D. 1.00 to 1.80 mm
Most of the bacteria in sewage are______________?
A. parasitic
B. saprophytic
C. pathogenic
D. anaerobic
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)________________?
A. N = y + R
B. y = N + R
C. R = N + y
D. R > (N + y)
The hydraulic mean depth (HMD. for an egg-shaped sewer flowing two-third full is_______________?
A. equal to HMD when flowing full
B. less than HMD when flowing full
C. greater than HMD when flowing full
D. none of the above
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be__________________?
A. 4 mm/hr
B. lOmm/hr
C. 20 mm/hr
D. 40 mm/hr
Scour valves are provided ______________?
A. at street corners to control the flow of water
B. at every depression and dead ends to drain out the waste water that may collect there
C. at the foot of rising main along the slope to prevent back running of water
D. at every summit of rising mains
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is_______________?
A. check valve
B. sluice valve
C. safety valve
D. scour valve
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