Civil Engineering MCQs

Page No. 23

If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?


aHydrogen sulphide

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bCarbon dioxide

✓


cMethane

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dOxygen

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View Answer Carbon dioxide

The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?


a Imhoff tanks

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bTrickling filters

✓


cSludge sedimentation tanks

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d None of these

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View Answer Trickling filters

If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?


a1 in 60

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b 1 in 100

✓


c1 in 120

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dNone of these

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View Answer 1 in 100

The grit and silt of the grit chambers, may not be used for_________________?


aRaising low lying areas by dumping

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bConcreting

✓


cBoth A. and B.

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d Neither A. nor B

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View Answer Concreting

Imhoff cone is used to measure________________?


a Total organic solids

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bTotal solids

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cTotal in organic solids

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d Settleable solids

✓


View Answer Settleable solids

Dilution method of disposing of sewage, is not preferred to_______________?


aWhen sewage is fresh

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bWhen diluting water has high dissolved oxygen content

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c When diluting water is used for water supply near the point of sewage disposed

✓


dWhen the diluting water is having flow currents

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The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is_________________?


a1 in 100 upward

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b 1 in 500 upward

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c 1 in 100 downward

✓


d1 in 503 upward

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View Answer 1 in 100 downward

For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________?


aH2SO4

✓


bHNO3

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cHCl

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dNone of these

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View Answer H2SO4

In sewers the velocity of flow should not be_________________?


aMore than the self-cleansing velocity

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b Less than the self-cleansing velocity

✓


c Less than 10 m/sec

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dMore than 20 m/sec

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In sewers the effect of scouring is more on__________________?


aTop side

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bBottom side

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cHorizontal side

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dAll sides

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View Answer Bottom side

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