Civil Engineering MCQs

Page No. 40

The recommended detention period for grit chambers is_______________?


a1 minute


b2 minutes


c 3 minutes


d5 minutes


View Answer 1 minute

For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed__________________?


a1.5


b2.0


c2.5


d 3.0


View Answer 2.0

In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is_______________?


a D


bD /2


cD/3


d D/4


View Answer D/4

The design period of sewage treatment works in normally_________________?


a5 – 10 years


b15 – 20 years


c30 – 40 years


d40 – 50 years


View Answer 15 – 20 years

The effluent of a septic tank is_________________?


aFit for discharge into any open drain


bFoul and contains dissolved and suspended solids


cAs good as that from a complete treatment


dNone of these



The detention time (t) of a settling tank, may be defined as the time required for_________________?


aA particle to travel along its length


b A particle to travel from top surface to bottom sludge zone


cThe flow of sewage to fill the tank


dNone of these



The liquid wastes from kitchens, bath rooms and wash basins, is not called________________?


aLiquid waste


bSullage


cSewage


dNone of these


View Answer Sewage

Large diameter sewers subjected to external pressure alone, are reinforced ______________________?


a Near the inner surface of the pipe


bNear the outer surface of the pipe


cBoth A. and B.


dWith elliptical cage


View Answer With elliptical cage

The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?


a1.5


b2.0


c3.0


d4.0


View Answer 1.5

For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?


a Cast iron sewers


b Cement concrete sewers


cGlazed bricks sewers


dStone ware sewers


View Answer Glazed bricks sewers

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