Civil Engineering MCQs

Page No. 177

The effect of increasing diameter of sewer on the self cleansing velocity is_____________?


a to decrease it

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b to increase it

✓


c fluctuating

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dnil

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View Answer to increase it

The velocity of flow does not depend on_______________?


agrade of sewer

✖


blength of sewer

✓


chydraulic mean depth of sewer

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droughness of sewer

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View Answer length of sewer

Most suitable section of sewer in separate sewage system is________________?


arectangular section

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bcircular section

✓


cstandard form of egg shaped sewer

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dmodified egg shaped section

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View Answer circular section

The minimum and maximum diameters of sewers shall preferably be_________________?


a15 cm and 100 cm

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b15 cm and 300 cm

✓


c30 cm and 450 cm

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d60 cm and 300cm

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View Answer 15 cm and 300 cm

The design discharge for the separate sewer system shall be taken as_____________?


aequal to dry weather flow (DWF)

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b2xDWF

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c3 x DWF

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d6xDWF

✓


View Answer 6xDWF

The self cleansing velocity for all sewers in India is usually_________________?


a less than 1.0 m/sec

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b1.0 m/sec to 1.2 m/sec

✓


c1.5 m/sec to 2.0 m/sec

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d 3.0 m/sec to 3.5 m/sec

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The time of concentration is defined as_______________?


a the time taken by rainfall water to run from most distant point of water shed to the inlet of sewer

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b the time required for flow of water in sewer to the point under consideration

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csum of (A) and (B)

✓


d difference of (A) and (B)

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View Answer sum of (A) and (B)

The water carriage system of collection of waste product________________?


ais cheaper in initial cost than dry conservancy system

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b requires treatment before disposal

✓


c creates hygenic problem

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d all of the above

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Which of the following sewers is preferred for combined system of sewage ?


a circular sewer

✖


begg shaped sewer

✓


crectangular sewer

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dnone of the above

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View Answer egg shaped sewer

Average rate of water consumption perhead per day as per Indian Standard is______________?


a100 litres

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b135 litres

✓


c 165 litres

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d200 litres

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View Answer 135 litres

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