Civil Engineering MCQs

Page No. 176

Laying of sewers is usually done with the help of________________?


aa theodolite


ba compass


csight rails and boning rods


da plane table



Sewerage system is designed for_______________?


amaximum flow only


bminimum flow only


caverage flow only


dmaximum and minimum flow



Facultative bacteria are able to work in________________?


apresence of oxygen only


babsence of oxygen only


cpresence as well as in absence of oxygen


dpresence of water



The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?


a 1


b100


cinfinite


dzero


View Answer 100

In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be___________?


a100 ppm


b200 ppm


c300 ppm


d400 ppm


View Answer 200 ppm

The rate of BOD exerted at any time is_____________?


a directly proportional to BOD satisfied


bdirectly proportional to BOD remain-ing


cinversely proportional to BOD satisfied


d inversely proportional to BOD re-maining



Standard BOD is measured at________________?


a20°C – 1day


b 25°C- 3day


c 20°C – 5day


d30°C- 5day


View Answer 20°C – 5day

Sewage treatment units are normally designed for______________?


a5-10 years


b15-20 years


c 30-40 years


d40-50 years


View Answer 15-20 years

The pathogens can be killed by_______________?


anitrification


bchlorination


coxidation


dnone of the above


View Answer chlorination

The type of sewer which is suitable for both combined and separate system is_____________?


acircular sewer


begg shaped sewer


chorse-shoe type sewer


dsemi-elliptical sewer


View Answer egg shaped sewer

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