Civil Engineering MCQs

Page No. 48

A well oxidized sewage contains nitrogen mainly as___________________?


aNitrates

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bNitrites

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cFree ammonia

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dNone of these

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View Answer Nitrates

If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________?


a100 mg/l

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b200 mg/l

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c300 mg/l

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d 400 mg/l

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View Answer 400 mg/l

Self-cleansing velocity is__________________?


aVelocity at dry weather flow

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bVelocity of water at flushing

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c Velocity at which no accumulation remains in the drains

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dVelocity of water in a pressure filter

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15 cumecs, the depth d and width are related by For drains up to___________________?


a d = 0.2 B

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bd = 0.5 B

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c B = 0.2 d

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dB = 0.5 d

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View Answer d = 0.5 B

The rate of accumulation of sludge in septic tanks is recommended as____________________?


a30 litres/person/year

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b25 litres/person/year

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c30 litres/person/month

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d25 litres/person/month

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View Answer 30 litres/person/year

In a trickling filter_________________?


aFiltration process is used

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bBiological action is used

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cNeither A. nor B.

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dBoth A. and B.

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If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?


a2 hours

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b4 hours

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c6 hours

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d8 hours

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View Answer 8 hours

Hume steel pipes are__________________?


aSteel pipes

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bSteel shell coated from inside with cement mortar

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cSteel shell coated from outside with cement mortar

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dBoth B. and C.

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View Answer Both B. and C.

The detention period for plain sedimentation water tanks, is usually____________________?


a4 to 8 hours

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b8 to 16 hours

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c16 to 24 hours

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d 24 to 36 hours

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View Answer 4 to 8 hours

If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is_________________?


a 100 cm

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b90 cm

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c80 cm

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d50 cm

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View Answer 100 cm

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