The standard B.O.D. of water is taken for_________________?
The standard B.O.D. of water is taken for_________________?
A. 1 day
B. 2 days
C. 3 days
D. 5 days
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In an immersed body, center of pressure is ____________________?
In an immersed body, center of pressure is ____________________?A. at the center of gravity
B. above the center of gravity
C. below be center of gravity
D. could be above or below e.g. depending on density of body and liquid
E. unpredictableIf the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________?
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________?A. 1 in 60
B. 1 in 100
C. 1 in 120
D. None of theseFor pipes, turbulent flow occurs when Reynolds number is_________________?
For pipes, turbulent flow occurs when Reynolds number is_________________?A. less than 2000
B. between 2000 and 4000
C. more than 4000
D. less than 4000
E. none of the aboveTo prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________?A. 0.50 m/sec
B. 0.60 m/sec
C. 0.70 m/sec
D. 0.75 m/secThe maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?A. 20 m
B. 30 m
C. 45 m
D. 75 mPick up the incorrect size of stone ware sewers_________________?
Pick up the incorrect size of stone ware sewers_________________?A. 52.5 cm
B. 67.5 cm
C. 82.5 cm
D. None of these