Civil Engineering MCQs

Page No. 27

In a fully mechanised composting plant, involves________________?


aMechanized receipt


bMechanized segregation


cMechanized pulverising of refuse


d All of these


View Answer All of these

weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?


aw r S S


bw r1/2


cw r S


dw r2/3


View Answer w r S S

The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________?


ad² (0.011d + 0.785H)/Q


bd (0.022d + 0.085H)/Q


cd (0.785d + 0.011H)/Q


dd (0.285d + 0.011H)/Q



Antisyphonage pipe is fitted_______________?


aAt the end of septic tanks


b On manholes


c With a W.C. trap


dAt the beginning of sewer line


View Answer With a W.C. trap

pH value of sludge during alkaline regression stage, is__________________?


aMore than 7


bLess than 7


cLess than 6


dMore than 6


View Answer More than 7

Pick up the incorrect size of stone ware sewers_________________?


a52.5 cm


b 67.5 cm


c82.5 cm


dNone of these


View Answer 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_________________?


aBoth A and R is true and R is the correct explanation of A


bBoth A and R is true but R is not a correct explanation of A


cA is true but R is false


dA is false but R is true



The clarigesters are_________________?


aCircular septic tanks


b Rectangular septic tanks


cCircular Imhoff double tanks with bottom hoppers


dCircular Imhoff double storey tanks without bottom hoppers



In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?


a100 mm dia.


b 150 mm dia.


c225 mm dia.


dAll of these


View Answer 225 mm dia.

If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?


aD’ = 0.64 D


b D’ = 0.74 D


cD’ = 0.84 D


dD’ = 0.94 D


View Answer D’ = 0.84 D

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