Civil Engineering MCQs

Page No. 35

The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?


a100 cm

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b110 cm

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c120 cm

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d150 cm

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View Answer 120 cm

Drop manholes at the junctions of sewer lines, are provided if________________?


aInvert level of a branch sewer is more than 60 cm that of the main sewer

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bSewer line runs along a main road

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cOrdinary manhole cannot be built

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d Two sewer lines intersect

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During purification process of sewage the gas given off, is________________?


aCarbon dioxide

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bHydrogen

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cAmmonia

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d All the above

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View Answer All the above

The sewerage system originates from__________________?


aHouse sewers

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b Lateral sewers

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c Branch sewers

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dMain sewers

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View Answer House sewers

In septic tanks, decomposition of organic bacteria, is done by_____________________?


aAnaerobic bacteria

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bAerobic bacteria

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cBoth types of bacterias

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dNone of these

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View Answer Anaerobic bacteria

Sewer pipes need be checked for_________________?


aMinimum flow

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bMaximum flow

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cBoth A. and B.

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d None of these

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View Answer Both A. and B.

hydraulically equivalent, the relationship which holds good, is _______________?


aD8/3 = 4 b8/3

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bD3/8 = 4 b3/8

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c D2/3 = 4 b2/3

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d D3/2 = 4 b3/2

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View Answer D8/3 = 4 b8/3

Sewer manholes are generally provided at________________?


a The change of gradient

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bThe change of direction

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cThe junctions of sewers

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d All of these

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View Answer All of these

Aerobic activity is maximum_______________?


a In freshly produced sewage

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bAt sewer pipes

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c In sewer treatment plants

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dNone of these

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Before discharging the foul sewage into rivers, it is generally treated by_____________________?


aScreening

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bSedimentation

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cOxidation

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dAll the above

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View Answer All the above

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