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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

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

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Environmental Engineering
In facultative stabilization pond, the sewage is treated by

Aerobic bacteria only
Dual action of aerobic bacteria and anaerobic bacteria
Sedimentation
Algae only

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Environmental Engineering
Settling velocity increases with

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

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Environmental Engineering
The method of analysis of distribution system in which the domestic supply is neglected and fire demand is considered is

Equivalent pipe method
Hardy cross method
Electrical analysis method
Circle method

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Environmental Engineering
A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called

Lateral sewer
Main sewer
House sewer
Sub-main sewer

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Environmental Engineering
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

4.5 to 6.0
10.5 to 12.0
8.5 to 10.0
6.5 to 8.0

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