Civil Engineering MCQs

Page No. 40

The recommended detention period for grit chambers is_______________?


a1 minute

✓


b2 minutes

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c 3 minutes

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d5 minutes

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View Answer 1 minute

For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed__________________?


a1.5

✖


b2.0

✓


c2.5

✖


d 3.0

✖


View Answer 2.0

In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is_______________?


a D

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bD /2

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cD/3

✖


d D/4

✓


View Answer D/4

The design period of sewage treatment works in normally_________________?


a5 – 10 years

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b15 – 20 years

✓


c30 – 40 years

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d40 – 50 years

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View Answer 15 – 20 years

The effluent of a septic tank is_________________?


aFit for discharge into any open drain

✓


bFoul and contains dissolved and suspended solids

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cAs good as that from a complete treatment

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dNone of these

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The detention time (t) of a settling tank, may be defined as the time required for_________________?


aA particle to travel along its length

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b A particle to travel from top surface to bottom sludge zone

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cThe flow of sewage to fill the tank

✓


dNone of these

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The liquid wastes from kitchens, bath rooms and wash basins, is not called________________?


aLiquid waste

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bSullage

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cSewage

✓


dNone of these

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View Answer Sewage

Large diameter sewers subjected to external pressure alone, are reinforced ______________________?


a Near the inner surface of the pipe

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bNear the outer surface of the pipe

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cBoth A. and B.

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dWith elliptical cage

✓


View Answer With elliptical cage

The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?


a1.5

✓


b2.0

✖


c3.0

✖


d4.0

✖


View Answer 1.5

For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?


a Cast iron sewers

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b Cement concrete sewers

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cGlazed bricks sewers

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dStone ware sewers

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View Answer Glazed bricks sewers

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