Civil Engineering MCQs

Page No. 26

‘Cowl’ is provided at___________________?


a Lower end of ventilating column

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bUpper end of ventilating column

✓


cUpper end of the manhole

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dFirst step in manhole

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A drop manhole is provided if__________________?


a A sewer drops from a height

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bA branch sewer joins the main sewer at higher level

✓


c A lamp is inserted to check obstruction

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d None of these

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The use of coarse screens for the disposal of sewage, may be dispensed with by______________?


aComminutor

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bShredder

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

For detecting the nitrates in sewage, the colour may be developed by adding________________?


aPotassium permanganate

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bSulphuric acid and napthamine

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cPhenol-di -sulphuric acid and potassium hydroxide

✓


dNone of these

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In septic tanks__________________?


aFree board of 0.3 m may be provided

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bThe baffles or tees are extended up to top level of scum

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cThe clear space between the baffle top and covering slab is about 7.5 cm

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dAll the above

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View Answer All the above

Stone ware pipes are_______________?


aHighly resistant to sulphide corrosion

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bHighly impervious

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cHydraulically efficient because of their smooth interior surface

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d Especially suited to pressure pipes

✓



The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________?


a1.095

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b1.085

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c1.075

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d 1.065

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View Answer 1.095

Drop manholes are the manholes___________________?


aWithout entry ladders

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b Without manhole covers

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cWith depths more than 3.5 m

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d Having drains at different levels

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If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________?


a200 ppm

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b225 ppm

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c250 ppm

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dNone of these

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View Answer 250 ppm

The sewers___________________?


aMust be of adequate size to avoid over flow

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bMust flow under gravity ½ to ¾ full

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c Must be laid at least 2 to 3 m deep to collect /water from the basements

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d All the above

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View Answer All the above

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