A. Alum
B. Ferric chloride
C. Ferric sulphate
D. Chlorinated copperas
0
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If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains_______________?
0
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The Chezy’s constant C in the formula V = C_________________?
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
0
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For the open drain (N = 0.025) shown in the below figure, the discharge is________________?
A. Size of the sewer
B. Shape of the sewer
C. Roughness of sewer surface
D. All the above
0
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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. 26.88 cumecs
B. 27.88 cumecs
C. 28.88 cumecs
D. 29.88 cumecs
0
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The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is__________________?
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
0
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The rational formula for peak drainage discharge, was evolved by_________________?
A. 0.10 cumec
B. 0.12 cumec
C. 0.15 cumec
D. 0.20 cumec
0
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Dry weather flow is__________________?
A. Fruhling
B. Lloyd David
C. Kuichling
D. All of these
0
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¾th or ¼th extra space is left in sewer pipes at maximum discharge for_________________?
A. Average daily rate of flow
B. Average monthly rate of flow
C. Average annual rate of flow
D. Water supply allowance per capita
0
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Aerobic bacterias___________________?
A. Low estimates of the average and maximum flows
B. Large scale infiltration of storm water
C. Unexpected increase in population
D. All the above