Civil Engineering MCQs

Page No. 51

The Chezy’s constant C in the formula V = C_________________?


aSize of the sewer


bShape of the sewer


c Roughness of sewer surface


d All the above


View Answer All the above

If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains_______________?


aHydrogen sulphide


bCarbon dioxide


cMethane


dOxygen


View Answer Methane

The coagulant which is generally not used for treating the sewage, is__________________?


aAlum


bFerric chloride


cFerric sulphate


dChlorinated copperas


View Answer Alum

Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is ?


aCentrifugal pump


bPneumatic ejector


c Reciprocating pump


dNone of these


View Answer Centrifugal pump

Pick up the correct statement from the following ?


aThe sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge


bThe sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge


cThe minimum design velocity of sewer pipes is taken as 0.8 m/sec


d All the above


View Answer All the above

Acid regression stage of sludge digestion at a temperature 21°C extends over a period of______________?


a15 days


b30 days


c 60 days


d90 days


View Answer 90 days

No treatment of the sewage is given if dilution factor is_____________?


aLess than 150


bBetween 150 to 200


cBetween 200 to 300


dMore than 500


View Answer More than 500

The pressure exerted by_____________?


aThe sewage when running full from inside, is called internal pressure


b The internal pressure if any, causes tensile stress in the pipe material


cPressure sewers are designed to be safe in tension


dAll the above


View Answer All the above

For efficient working of a sewer, it must be ensured that _____________?


aMinimum velocity of 0.45 m/sec, is maintained at its minimum flow


bA maximum velocity of 0.90 m/sec, is maintained at its maximum flow


c Both A. and B.


dNeither A. nor B.


View Answer Both A. and B.

For a continuous flow type of sedimentation tanks__________________?


aWidth of the tank is normally kept about 6 m


bLength of the tank is normally kept 4 to 5 times the width


cMaximum horizontal flow velocity is limited to 0.3 m/minute


dAll the above


View Answer All the above

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