In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?
A. Q/(B × D)
B. Q/(L × D)
C. Q/L
D. Q/(B × L)
Civil Engineering Mcqs
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________?
A. Bio-Chemical Oxygen Demand (B.O.D.)
B. Dissolved Oxygen (D.O.)
C. Chemical Oxygen Demand (C.O.D.)
D. None of these
Water content of sewage is about___________________?
Water content of sewage is about___________________?
A. 90 %
B. 95 %
C. 99 %
D. 9.9 %
The most efficient cross-section of sewers in a combined sewerage system is________________?
The most efficient cross-section of sewers in a combined sewerage system is________________?
A. Parabolic
B. Circular
C. Rectangular
D. New egged
The factor responsible for purification of sewage in river is________________?
The factor responsible for purification of sewage in river is________________?
A. Hydrology
B. Dissolved oxygen in water
C. Temperature
D. All the above
To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?
To maintain aerobic biological activity, the moisture content of the compost mass should be about_________________?
A. 45 %
B. 50 %
C. 55 %
D. 60 %
The pH value of sewage is determined with the help of_________________?
The pH value of sewage is determined with the help of_________________?
A. Imhoff Cone
B. Turbid meter
C. Potentiometer
D. None of these
The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?
The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?
A. 25,000 to 35,000 litres/sqm/day
B. 40,000 to 50,000 litres/sqm/day
C. 50,000 to 60,000 litres/sqm/day
D. 80,000 to 100,000 litres/sqm/day
Which one of the following statements regarding septic tanks is wrong ?
Which one of the following statements regarding septic tanks is wrong ?
A. A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
B. The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
C. The minimum width of septic level is 90 cm
D. The depth of tank is kept equal to its width
In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?
In areas where rainy season is limited to a few months, the type of sewerage system recommended is__________________?
A. Combined system
B. Partially separate system
C. Separate system
D. None of these