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.Management Sciences
Category: Waste Water Engineering
Sludge banks are formed if sewage is disposed of in____________________ ?
A. Rivers
B. Seas
C. Lakes
D. None of these
Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?
A. Both A and R is true and R is the correct explanation of A
B. Both A and R is 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
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?
A. d² (0.011d + 0.785H)/Q
B. d (0.022d + 0.085H)/Q
C. d (0.785d + 0.011H)/Q
D. d (0.285d + 0.011H)/Q
The rainfall at any place may be determined by__________________?
A. Its intensity
B. Its direction
C. Its frequency
D. All the above
In a fully mechanised composting plant, involves________________?
A. Mechanized receipt
B. Mechanized segregation
C. Mechanized pulverising of refuse
D. All of these
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?
A. 1 in 100 upward
B. 1 in 500 upward
C. 1 in 100 downward
D. 1 in 503 upward
A well oxidized sewage contains nitrogen mainly as___________________?
A. Nitrates
B. Nitrites
C. Free ammonia
D. None of these
A circular sewer section is preferred to because__________________?
A. It is cheaper in construction
B. It provides maximum area for a given perimeter
C. It provides maximum hydraulic mean depth
D. All the above
Pick up the incorrect statement from the following for allowing workers to enter sewers_______________?
A. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
B. Proper tests for the presence of poisonous gases must be carried out
C. The men entering the manhole should be advised to smoke in the sewer
D. Warning signals should be erected
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?
A. Q/(B × D)
B. Q/(L × D)
C. Q/L
D. Q/(B × L)
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