Environmental Engineering in CE
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 waterThe correct answer is

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

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Environmental Engineering in CE
Smoke is produced due to

Insufficient supply of combustion air and insufficient time for combustion
Poor design & overloading of furnace
All of these
Poor quality of fuel and improper mixing of fuel & combustion air

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