Civil Engineering MCQs

Page No. 32

The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is______________________?


a213.5 cm/sec


b313.5 cm/sec


c413.5 cm/sec


d 500 cm/sec


View Answer 313.5 cm/sec

For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?


aKinchling


bLloyd Davis


cFrubling


dAll the above


View Answer All the above

The most effective arrangement for diverting excess storm water into a natural drainage, is____________________?


a Leaping weir


bOverflow weir


c Siphon spill way


dNone of these


View Answer Siphon spill way

For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________?


a10 cm


b12 cm


c 15 cm


d18 cm


View Answer 15 cm

You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?


aFull depth


bHalf full


cTwo third full


dThree fourth full


View Answer Half full

In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is____________________?


a[(100 + P1)/(100 – P2)] V1


b[(100 – P1)/(100 + P2)] V1


c[(100 – P1)/(100 – P2)] V1


d[(100 + P2)/(100 – P1)] V1



The sewage treatment in septic tanks is due to__________________?


a Anaerobic decomposition


bAerobic decomposition


cParasitic decomposition


dNone of these



If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?


aChezy


bManning


cBazin


dKutter


View Answer Manning

3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is______________________?


a100 mg/l


b 200 mg/l


c300 mg/l


d400 mg/l


View Answer 300 mg/l

Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer?


a Both A and R are true and R is the correct explanation of A


b Both A and R are true but R is not a correct explanation of A


cA is true but R is false


d A is false but R is true



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