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Environmental Engineering

Environmental Engineering
Laying of sewers is usually done with the help of

A Theodolite
Sight rails and boning rods
A plane table
A compass

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Environmental Engineering
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

0.01 to 0.05 ppm
0.05 to 0.5 ppm
1.0 to 5.0 ppm
0.5 to 1.0 ppm

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Environmental Engineering
Period of cleaning of slow sand filters is about

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

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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

Sluice valve
Reflux valve
Air relief valve
Pressure relief valve

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Environmental Engineering
Activated carbon is used for

Removing hardness
Disinfection
Removing odours
Removing corrosiveness

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Environmental Engineering
The main disadvantage of oxidation pond is that

BOD removal is very low
Large area is required for construction
None of these
Maintenance and operation cost are high

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