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Environmental Engineering

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

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

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Environmental Engineering
Which of the following compounds is widely used for algae control?

Copper sulphate
Sodium chloride
Calcium chloride
Sodium sulphate

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Environmental Engineering
The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is

Scour valve
Sluice valve
Check valve
Safety valve

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Environmental Engineering
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

40 mm/hr
10 mm/hr
20 mm/hr
4 mm/hr

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Environmental Engineering
The alum, when added as a coagulant in water

Does not require alkalinity in water for flocculation
Does not affect pH value of water
Increases pH value of water
Decreases pH value of water

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Environmental Engineering
Disinfection efficiency is

Highest at pH value equal to 7
Unaffected by pH value of water
Reduced at higher pH value of water
Increased at higher pH value of water

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