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Environmental Engineering

Environmental Engineering
As compared to cast iron pipes, steel pipes are

Costlier
Heavier
Less susceptible to corrosion
Stronger

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Environmental Engineering
A sewer that receives the discharge of a number of house sewers is called

Intercepting sewer
House sewer
Lateral sewer
Sub-main sewer

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Environmental Engineering
The devices which are installed for drawing water from the sources are called

Intakes
Filters
Aquiclude
Aquifers

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

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

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Environmental Engineering
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be

300 ppm
200 ppm
100 ppm
400 ppm

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Environmental Engineering
The overflow rate for plain sedimentation tanks is about

1500 to 2000 liters/hour/m²
1250 to 1500 liters/hour/m²
500 to 750 liters/hour/ m²
1000 to 1250 liters/hour/ m²

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