Exercise: Waste Water Engineering

Questions for: Waste Water Engineering

Assertion (A) : The determination of pH value of sewerage is important.

Reason (R) : The efficiency of certain treatment methods depends upon the availability of pH value.

A:
Both A and R are true and R is the correct explanation of A
B:
Both A and R are true but R is not a correct explanation of A
C:
A is true but R is false
D:
A is false but R is true.
Answer: A
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In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is
A:
B:
C:
D:
Answer: C
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Stone ware pipes are
A:
highly resistant to sulphide corrosion
B:
highly impervious
C:
hydraulically efficient because of their smooth interior surface
D:
specially suited to pressure pipes
Answer: D
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If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is
A:
1 in 60
B:
1 in 100
C:
1 in 120
D:
none of these.
Answer: A
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Hazin's formula is used for the settlement velocity of the particles of diameter
A:
less than 0.01 mm
B:
less than 0.05 mm
C:
less than 0.1 mm
D:
greater than 0.1 mm.
Answer: D
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