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Environmental Engineering

Environmental Engineering
Orthotolidine test is used for determination of

Residual chlorine
Dissolved oxygen
Biochemical oxygen demand
Dose of coagulant

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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
40 mm/hr
20 mm/hr

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Environmental Engineering
The working conditions in imhoff tanks are

Aerobic in lower compartment and anaerobic in upper compartment
Anaerobic only
Aerobic only
anaerobic in lower compartment and aerobic in upper compartment

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Environmental Engineering
The per capital consumption of a locality is affected by (i) Climatic conditions (ii) Quality of water (iii) Distribution pressure

Only (i)
Both (i) and (iii)
All (i), (ii) and (iii)
Both (i) and (ii)

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Environmental Engineering
The layout of distribution system in which water flows towards the outer periphery is

Radial system
Dead end system
Grid iron system
Ring system

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Environmental Engineering
The process of lagooning is primarily a means of

Disposing of sludge
Increasing the capacity of storage reservoirs
Increasing flow of sewage through imhoff tanks
Reducing the excessive flow in sewers

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