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Environmental Engineering

Environmental Engineering
Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank

(i) and (ii)
Only (i)
Only (iii)
(i) and (iii)

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Environmental Engineering
The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is

10100
10920
9500
9800

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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
The maximum efficiency of BOD removal is achieved in

Oxidation pond
Oxidation ditch
Aerated lagoons
Trickling filters

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

Sodium sulphate
Copper sulphate
Calcium chloride
Sodium chloride

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Environmental Engineering
The rate of filtration in slow sand filters in million litres per day per hectare is about

50 to 60
1400 to 1500
100 to 150
500 to 600

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