🏗️Civil Engineering MCQs
Civil Engineering MCQs
479 MCQs241
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?
AImhoff tanks
BTrickling filters
CSludge sedimentation tanks
DNone of these
242
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________?
A1 in 60
B1 in 100
C1 in 120
DNone of these
243
The grit and silt of the grit chambers, may not be used for_________________?
Anor B
BD. Neither
CBoth
244
Antisyphonage pipe is fitted_______________?
AAt the end of septic tanks
BOn manholes
Ctrap
DAt the beginning of sewer line
245
pH value of sludge during alkaline regression stage, is__________________?
AMore than 7
BLess than 7
CLess than 6
DMore than 6
246
Pick up the incorrect size of stone ware sewers_________________?
A52.5 cm
B67.5 cm
C82.5 cm
DNone of these
247
Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?
ABoth A and R is true and R is the correct explanation of A
BBoth A and R is true but R is not a correct explanation of A
CA is true but R is false
DA is false but R is true
248
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________?
AA heap
BPlateau
CWindrow
DNone of these
249
The gas which may cause explosion in sewers, is_________________?
ACarbondioxide
BMethane
CAmmonia
DCarbon monoxide
250
The discharge per unit plan area of a sedimentation tank, is generally called________________?
AOver flow rate
BSurface loading
COver flow velocity
DAll the above