Civil Engineering MCQs

Page No. 26

‘Cowl’ is provided at___________________?


a Lower end of ventilating column


bUpper end of ventilating column


cUpper end of the manhole


dFirst step in manhole



A drop manhole is provided if__________________?


a A sewer drops from a height


bA branch sewer joins the main sewer at higher level


c A lamp is inserted to check obstruction


d None of these



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


aComminutor


bShredder


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

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


aPotassium permanganate


bSulphuric acid and napthamine


cPhenol-di -sulphuric acid and potassium hydroxide


dNone of these



In septic tanks__________________?


aFree board of 0.3 m may be provided


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


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


dAll the above


View Answer All the above

Stone ware pipes are_______________?


aHighly resistant to sulphide corrosion


bHighly impervious


cHydraulically efficient because of their smooth interior surface


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


b1.085


c1.075


d 1.065


View Answer 1.095

Drop manholes are the manholes___________________?


aWithout entry ladders


b Without manhole covers


cWith depths more than 3.5 m


d Having drains at different levels



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


b225 ppm


c250 ppm


dNone of these


View Answer 250 ppm

The sewers___________________?


aMust be of adequate size to avoid over flow


bMust flow under gravity ½ to ¾ full


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


d All the above


View Answer All the above

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