Civil Engineering MCQs

Page No. 48

A well oxidized sewage contains nitrogen mainly as___________________?


aNitrates


bNitrites


cFree ammonia


dNone of these


View Answer Nitrates

If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________?


a100 mg/l


b200 mg/l


c300 mg/l


d 400 mg/l


View Answer 400 mg/l

Self-cleansing velocity is__________________?


aVelocity at dry weather flow


bVelocity of water at flushing


c Velocity at which no accumulation remains in the drains


dVelocity of water in a pressure filter



15 cumecs, the depth d and width are related by For drains up to___________________?


a d = 0.2 B


bd = 0.5 B


c B = 0.2 d


dB = 0.5 d


View Answer d = 0.5 B

The rate of accumulation of sludge in septic tanks is recommended as____________________?


a30 litres/person/year


b25 litres/person/year


c30 litres/person/month


d25 litres/person/month


View Answer 30 litres/person/year

In a trickling filter_________________?


aFiltration process is used


bBiological action is used


cNeither A. nor B.


dBoth A. and B.



If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?


a2 hours


b4 hours


c6 hours


d8 hours


View Answer 8 hours

Hume steel pipes are__________________?


aSteel pipes


bSteel shell coated from inside with cement mortar


cSteel shell coated from outside with cement mortar


dBoth B. and C.


View Answer Both B. and C.

The detention period for plain sedimentation water tanks, is usually____________________?


a4 to 8 hours


b8 to 16 hours


c16 to 24 hours


d 24 to 36 hours


View Answer 4 to 8 hours

If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is_________________?


a 100 cm


b90 cm


c80 cm


d50 cm


View Answer 100 cm

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