A. Light in weight
B. Not structurally strong to bear large compressive stress
C. Susceptible to corrosion by sulphuric acid
D. All the above
0
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided________________?
0
For drainage pipes in buildings the test applied before putting them to use, is__________________?
A. 15 cm c/c
B. 22.5 cm c/c
C. 30 cm c/c
D. 50 cm c/c
0
For a continuous flow type of sedimentation tanks__________________?
A. Water test
B. Smoke test
C. Straightness test
D. All the above
0
For efficient working of a sewer, it must be ensured that _____________?
A. Width of the tank is normally kept about 6 m
B. Length of the tank is normally kept 4 to 5 times the width
C. Maximum horizontal flow velocity is limited to 0.3 m/minute
D. All the above
0
The pressure exerted by_____________?
A. Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
B. A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
C. Both A. and B.
D. Neither A. nor B.
0
No treatment of the sewage is given if dilution factor is_____________?
A. The sewage when running full from inside, is called internal pressure
B. The internal pressure if any, causes tensile stress in the pipe material
C. Pressure sewers are designed to be safe in tension
D. All the above
0
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of______________?
A. Less than 150
B. Between 150 to 200
C. Between 200 to 300
D. More than 500
