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Environmental Engineering

Environmental Engineering
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

4 mm/hr
10 mm/hr
20 mm/hr
40 mm/hr

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Environmental Engineering
Settling velocity increases with

Depth of tank
Specific gravity of solid particles
Temperature of liquid
Size of particles

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Environmental Engineering
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

0.2 to 0.4
0.4 to 1.0
2 to 4
5 to 7

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Environmental Engineering
Disinfection efficiency is

Reduced at higher pH value of water
Highest at pH value equal to 7
Increased at higher pH value of water
Unaffected by pH value of water

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Environmental Engineering
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

R = N + y
R > (N + y)
y = N + R
N = y + R

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Environmental Engineering
The minimum and maximum diameters of sewers shall preferably be

15 cm and 300 cm
15 cm and 100 cm
60 cm and 300 cm
30 cm and 450 cm

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