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Environmental Engineering

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

Stronger
Less susceptible to corrosion
Costlier
Heavier

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Environmental Engineering
Sewerage system is usually designed for

25 years
27 years
28 years
26 years

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Environmental Engineering
Orthotolidine test is used for determination of

Residual chlorine
Dissolved oxygen
Dose of coagulant
Biochemical oxygen demand

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Environmental Engineering
The suitable method of forecasting population for a young and rapidly increasing city is

Arithmetical increase method
Geometrical increase method
Graphical method
Incremental increase method

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Environmental Engineering
The amount of coagulant needed for coagulation of water increases with (i) Increase in turbidity of water (ii) Decrease in turbidity of water (iii) Increase in temperature of water (iv) Decrease in temperature of water The correct answer is

(i)and(iv)
(ii) and (iv)
(i) and (ii)
(ii) and (iii)

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

Vent pipe
Waste pipe
Soil pipe
Anti-siphonage pipe

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