Civil Engineering MCQs

Page No. 51

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


aSize of the sewer

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bShape of the sewer

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c Roughness of sewer surface

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d All the above

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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

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bCarbon dioxide

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cMethane

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dOxygen

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View Answer Methane

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


aAlum

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bFerric chloride

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cFerric sulphate

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dChlorinated copperas

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View Answer Alum

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


aCentrifugal pump

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bPneumatic ejector

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c Reciprocating pump

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dNone of these

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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

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

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

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d All the above

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View Answer All the above

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


a15 days

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b30 days

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c 60 days

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d90 days

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View Answer 90 days

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


aLess than 150

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bBetween 150 to 200

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cBetween 200 to 300

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dMore than 500

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View Answer More than 500

The pressure exerted by_____________?


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

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

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cPressure sewers are designed to be safe in tension

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dAll the above

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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

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

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c Both A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

For a continuous flow type of sedimentation tanks__________________?


aWidth of the tank is normally kept about 6 m

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

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cMaximum horizontal flow velocity is limited to 0.3 m/minute

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dAll the above

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View Answer All the above

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