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Environmental Engineering

Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

5 to 10 cm/sec
15 to 30 cm/sec
15 to 30 cm/minute
15 to 30 cm/hour

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Environmental Engineering
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

BOD > COD > TOD
TOD > BOD > COD
TOD > COD > BOD
COD > BOD > TOD

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Environmental Engineering
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called

Soil pipe
Waste pipe
Anti-siphonage pipe
Vent pipe

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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

House sewer
Sub-main sewer
Main sewer
Lateral sewer

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Environmental Engineering
The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is

Air relief valve
Pressure relief valve
Sluice valve
Reflux valve

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Environmental Engineering
The depression of water table in a well due to pumping will be maximum(Where ‘R’ is the radius of influence)

At a distance R/2 from the well
None of these
Close to the well
At a distance R from the well

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