Civil Engineering MCQs

Page No. 30

In case of sewer lines_________________?


aWater test is carried out to check water tightness of the joints


bTest for straightness is carried out with the help of a lamp and mirror


c Obstruction test is carried out with the help of smooth ball of diameter 13 mm


dAll the above


View Answer All the above

A manhole is classified as shallow if its depth is between_________________?


a0.4 to 0.5 m


b0.5 to 0.7 m


c 0.7 to 0.9 m


d0.9 to 1.20 m


View Answer 0.7 to 0.9 m

The stone ware sewers_________________?


a Are used for carrying sewage and drainage from houses


bAre manufactured from clays and shale


c After casting are dried and burnt at temperature 150°C, 700°C and 1200°C


dAll the above


View Answer All the above

The most efficient cross section of sewers in a separate sewerage system is__________________?


aParabolic


bCircular


cRectangular


d New egged


View Answer Circular

For trunk and out-fall, the type of sewers generally used, is_____________________?


aStandard egg shaped


bCircular shaped


c Horse shoe shaped


dParabolic shaped


View Answer Horse shoe shaped

If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?


aDegradation


bActive decomposition


cRecovery


dCleaner water


View Answer Active decomposition

In sewers the highest non-scouring velocity is achieved in________________?


aGlazed bricks sewers


bCast iron sewers


cCement concrete sewers


dStone ware sewers


View Answer Glazed bricks sewers

The suitable cross-section of sewers to carry combined flow, is__________________?


aCircular


bEgg shaped


cRectangular


dHorse shoe shaped


View Answer Egg shaped

The minimum recommended diameter of sewers, is_________________?


a 5 cm


b10 cm


c15 cm


d 20 cm


View Answer 15 cm

If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?


a 2 hours


b3 hours


c 4 hours


d 5 hours


View Answer 4 hours

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