Civil Engineering - Waste Water Engineering

16. 

The normal value of over flow rates for plain primary sedimentation tanks, ranges between

A. 25, 000 to 35, 000 litres/sqm/day
B. 40, 000 to 50, 000 litres/sqm/day
C. 50, 000 to 60, 000 litres/sqm/day
D. 80, 000 to 100, 000 litres/sqm/day
E. none of these.

Answer: Option B

Explanation:

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17. 

The asbestos cement sewers are

A. light in weight
B. not structurally strong to bear large compressive stress
C. susceptible to corrosion by sulphuric acid
D. All the above.

Answer: Option D

Explanation:

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18. 

Bottom openings 15 cm x 15 cm in the standing baffle wall are provided

A. 15 cm c/c
B. 22.5 cm c/c
C. 30 cm c/c
D. 50 cm c/c.

Answer: Option B

Explanation:

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19. 

Faculative bacterias survive in

A. the presence of oxygen
B. the absence of oxygen
C. both cases (a) and (b)
D. neither (a) nor (b).

Answer: Option C

Explanation:

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20. 

The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

A. 1.5
B. 2.0
C. 3.0
D. 4.0

Answer: Option A

Explanation:

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