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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

1,00,000
4000
4,00,000
1000

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Environmental Engineering
An egg shaped section of sewer

Provides self cleansing velocity at low discharges
Is easy to construct
Is economical than circular section
Is more stable than circular section

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Environmental Engineering
Standard BOD is measured at

25°C - 3 day
30°C - 5 day
20°C - 5 day
20°C - 1 day

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Environmental Engineering
Which of the following unit works in anaerobic conditions?

Trickling filters
Sedimentation tank
Activated sludge treatment
Sludge digestion tank

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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

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

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Environmental Engineering
Which of the following causes a decrease in per capita consumption?

Better standard of living of the people
Good quality of water
Use of metering system
Hotter climate

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