Civil Engineering MCQs

Page No. 33

Dry water flow in a combined sewer, is______________________?


aIndustrial sewage


bDomestic sewage


cStorm water


d Inclusive of domestic and industrial sewage but excludes storm water


View Answer Storm water

In sewage having fully oxidised organic matter, the nitrogen exists in the form of________________?


aNitrites


bNitrates


cFree ammonia


dAluminoid nitrogen


View Answer Nitrates

Clogging of sewers, is caused due to_______________?


aSilting


bLow discharge


cGreasy and oily matters


dAll the above


View Answer All the above

The sewer pipe which carries sewage from a building for immediate disposal is______________?


aHouse sewer


bLateral sewer


cIntercepting sewer


dMain sewer


View Answer House sewer

If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________?


a1 in 60


b1 in 100


c1 in 120


dNone of these


View Answer 1 in 120

The sewage is pumped up_______________?


a From low lying areas


bFrom flat areas


cFrom basements


d All the above


View Answer All the above

Which one of the following tests is used for testing sewer pipes ?


a Water test


bBall test


cMirror test


d All of these


View Answer All of these

The non-clog pump which permits solid matter to pass out with the liquid sewage, is________________?


aCentrifugal pump


bReciprocating pump


cPneumatic ejector


dNone of these


View Answer Centrifugal pump

When drainage to sewage ratio is 20, the peak dry weather flow is_______________?


a 20% of the design discharge


bSlightly less than 5% of the design discharge


c Slightly more than 5% of the design discharge


dNone of these



Flocculated particles do not change their___________________?


aSize


bShape


cWeight


dNone of these


View Answer None of these

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