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31.

Scour valves are provided

A.	at street corners to control the flow of water	B.	at every depression and dead ends to drain out the waste water that may collect there
C.	at the foot of rising main along the slope to prevent back running of water	D.	at every summit of rising mains

32.

Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

A.	N = y + R	B.	y = N + R
C.	R = N + y	D.	R > (N + y)

33.

Sewerage system is usually designed for

A.	10 years	B.	25 years
C.	50 years	D.	75 years

34.

Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the

A.	hardness in water	B.	turbidity in water
C.	dissolved oxygen in water	D.	residual chlorine in water

35.

The design discharge for the separate sewer system shall be taken as

A.	equal to dry weather flow (DWF)	B.	2xDWF
C.	3 x DWF	D.	6xDWF

36.

The hourly variation factor is usually taken as

A.	1.5	B.	1.8
C.	2	D.	2.7

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