Civil Engineering MCQs

Page No. 22

The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________?


a30 minutes


b 1 hour


c 1 hour and 30 minutes


d 2 hours


View Answer 2 hours

Pick up the incorrect statement from the following for allowing workers to enter sewers_______________?


a The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes


bProper tests for the presence of poisonous gases must be carried out


cThe men entering the manhole should be advised to smoke in the sewer


dWarning signals should be erected



To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?


a0.50 m/sec


b0.60 m/sec


c0.70 m/sec


d0.75 m/sec


View Answer 0.75 m/sec

The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?


a25,000 to 35,000 litres/sqm/day


b40,000 to 50,000 litres/sqm/day


c50,000 to 60,000 litres/sqm/day


d80,000 to 100,000 litres/sqm/day



At the junction of sewers___________________?


a Top of smaller sewer is kept lower


bTop of larger sewer is kept lower


cTops of both the sewers are at the same level


d None of these


View Answer None of these

Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________________?


aUnexpected large scale infiltration of stream water


bUnexpected increase in the population


cUnder estimates of maximum and average flows


dAll of the above


View Answer All of the above

The sewer that unloads the sewage at the point of treatment is called_________________?


aMain sewer


bOutfall sewer


c Branch sewer


dHouse sewer


View Answer Outfall sewer

For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?


a 16 m


b20 m


c24 m


d30 m


View Answer 24 m

If q is the average sewage flow from a city of population P, the maximum sewage flow______________?


a Q = [(4 + )/(18 + )] q


bQ = [(18 + P)/(4 + )] q


c Q = [(18 + )/(4 + )] q


dQ = [(5 + )/((15 + )] q



If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?


a /2


b /4


c/3


dD


View Answer /3

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