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Environmental Engineering

Environmental Engineering
The chemical most commonly used to increase speed of sedimentation of sewage is

Sodium permanganate
Lime
Copper sulphate
Sulphuric acid

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Environmental Engineering
The water carriage system of collection of waste product

Requires treatment before disposal
All of these
Creates hygienic problem
Is cheaper in initial cost than dry conservancy system

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Environmental Engineering
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be

X/4
2X
X/2
X

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Environmental Engineering
Air binding phenomena in rapid sand filters occur due to

Low temperature
Higher turbidity in the effluent
Excessive negative head
Mud ball formation

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Environmental Engineering
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

5 to 7
2 to 4
0.2 to 0.4
0.4 to 1.0

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Environmental Engineering
The layout of distribution system in which water flows towards the outer periphery is

Ring system
Radial system
Dead end system
Grid iron system

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MORE MCQ ON Environmental Engineering

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