ENVIRONMENTAL ENGINEERING QUIZ

A pipe which is installed in the house drainage to preserve the water seal of traps is called

Anti-siphonage pipe

Vent pipe

Soil pipe

Waste pipe

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Most suitable section of sewer in separate sewage system is

Standard form of egg shaped sewer

Modified egg shaped section

Rectangular section

Circular section

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The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally

Less and more

Less and less

More and more

More and less

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The maximum permissible limit for fluoride in drinking water is

10 mg/liter

0.1 mg/liter

5 mg/liter

1.5 mg/liter

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The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle, is

Reinforced cement concrete

Steel

Copper

Cast iron

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Scour valves are provided

At street corners to control the flow of water

At every depression and dead ends to drain out the waste water that may collect there

At every summit of rising mains

At the foot of rising main along the slope to prevent back running of water

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The length of rectangular sedimentation tank should not be more than (Where ‘B’ is the width of the tank)

B

4B

2B

8B

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The effective size of sand particles used in slow sand filters is

0.25 to 0.35 mm

1.00 to 1.80 mm

0.60 to 1.00 mm

0.35 to 0.60 mm

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The biochemical treatment of sewage effluents is essentially a process of

Alkalinization

Dehydration

Reduction

Oxidation

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The pathogens can be killed by

Nitrification

Oxidation

None of these

Chlorination

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