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.Management Sciences
Category: Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for_________________?
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
The ratio of design discharge to the surface area of a sedimentation tank is called____________________?
A. Surface loading
B. Overflow rate
C. Overflow velocity
D. All of these
A sewer running partially full and hurried with back filled, fails in compression due to_________________?
A. Weight of the pipe
B. Weight of the back fill
C. Superimposed traffic loads
D. All the above
Flocculated particles do not change their___________________?
A. Size
B. Shape
C. Weight
D. None of these
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?
A. A heap
B. Plateau
C. Windrow
D. None of these
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
Fresh sewage may become stale in_________________?
A. One hour
B. Two to three hours
C. Three to four hours
D. Six hours
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] 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
The most effective arrangement for diverting excess storm water into a natural drainage, is____________________?
A. Leaping weir
B. Overflow weir
C. Siphon spill way
D. None of these
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