🏗️Civil Engineering MCQs
Civil Engineering MCQs
479 MCQs231
The most efficient cross-section of sewers in a combined sewerage system is________________?
AParabolic
BCircular
CRectangular
DNew egged
232
The factor responsible for purification of sewage in river is________________?
AHydrology
BDissolved oxygen in water
CTemperature
DAll the above
233
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?
A25,000 to 35,000 litres/sqm/day
B40,000 to 50,000 litres/sqm/day
C50,000 to 60,000 litres/sqm/day
D80,000 to 100,000 litres/sqm/day
234
At the junction of sewers___________________?
ATop of smaller sewer is kept lower
BTop of larger sewer is kept lower
CTops of both the sewers are at the same level
DNone of these
235
Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________________?
AUnexpected large scale infiltration of stream water
BUnexpected increase in the population
CUnder estimates of maximum and average flows
DAll of the above
236
The sewer that unloads the sewage at the point of treatment is called_________________?
AMain sewer
BOutfall sewer
CBranch sewer
DHouse sewer
237
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________?
A16 m
B20 m
C24 m
D30 m
238
If q is the average sewage flow from a city of population P, the maximum sewage flow______________?
AQ = [(4 + )/(18 + )] q
BQ = [(18 + P)/(4 + )] q
CQ = [(18 + )/(4 + )] q
DQ = [(5 + )/((15 + )] q
239
If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?
A/2
B/4
C/3
DD
240
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?
AHydrogen sulphide
BCarbon dioxide
CMethane
DOxygen