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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

4000
1000
1,00,000
4,00,000

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Environmental Engineering
Period of cleaning of slow sand filters is about

10 - 12 days
1 - 2 year
2 - 3 months
24 - 48 hours

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Environmental Engineering
The ratio of 5 day BOD to ultimate BOD is about

43894
1
43833
43864

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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

Circle method
Electrical analysis method
Equivalent pipe method
Hardy cross 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
An egg shaped section of sewer

Is more stable than circular section
Provides self cleansing velocity at low discharges
Is easy to construct
Is economical than circular section

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