Civil Engineering MCQs

Page No. 28

In case of Imhoff tanks_____________________?


aThe shape is rectangular


bDetention period is 2 hours


cThe velocity of flow is restricted to 0.30 m/minute


dAll the above


View Answer All the above

The maximum depth of sedimentation tanks, is kept__________________?


a3 m


b3.5 m


c 4 m


d4.5 m


View Answer 3 m

A sewer running partially full and hurried with back filled, fails in compression due to_________________?


aWeight of the pipe


bWeight of the back fill


cSuperimposed traffic loads


dAll the above


View Answer All the above

Kjeldahl nitrogen is a mixture of___________________?


aAmmonia and nitrogen


bNitrogen and organic nitrogen


cOrganic nitrogen and ammonia


dAll the above


View Answer All the above

Nitrogen cycle of sewage, is____________________?


aLiberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen


b Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates


c Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia


dFormation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates



The minimum diameter of a sewer is kept __________________?


a10 cm


b 15 cm


c20 cm


d25 cm


View Answer 15 cm

Pick up the correct statement from the following _________________?


aThe materials separated by screens, is called screenings


bThe screenings are disposed off either by burning or by burial or by dumping


c The process of burning the screenings, is known as compositing


dAll the above


View Answer All the above

An inverted siphon is designed generally for____________________?


aOne pipe


bTwo pipes


cThree pipes


dFour pipes


View Answer Three pipes

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


bLess than 0.05 mm


cLess than 0.1 mm


dGreater than 0.1 mm


View Answer Greater than 0.1 mm

In sewers designed with self cleansing velocity________________?


aThe bottom is silted


bThe bottom is scoured


cBoth silting and scouring occur at the bottom


d Neither silting nor scouring occurs at the bottom



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