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Environmental Engineering

Environmental Engineering
The effective size of sand particles used in slow sand filters is

0.25 to 0.35 mm
0.60 to 1.00 mm
1.00 to 1.80 mm
0.35 to 0.60 mm

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Environmental Engineering
Most suitable section of sewer in separate sewage system is

Standard form of egg shaped sewer
Modified egg shaped section
Rectangular section
Circular section

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

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

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Environmental Engineering
An egg shaped section of sewer

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

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Environmental Engineering
Laying of sewers is usually done with the help of

Sight rails and boning rods
A Theodolite
A compass
A plane table

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

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