A. Are used for carrying sewage and drainage from houses
B. Are manufactured from clays and shale
C. After casting are dried and burnt at temperature 150°C, 700°C and 1200°C
D. All the above
Related Mcqs:
- 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 - Stone ware pipes are_______________?
A. Highly resistant to sulphide corrosion
B. Highly impervious
C. Hydraulically efficient because of their smooth interior surface
D. Especially suited to pressure pipes - A heavy stone is suitable for________________?
A. arches
B. rubble masonry
C. roads
D. retaining walls - A good building stone should not absorb water more than_____________?
A. 5%
B. 10%
C. 15%
D. 20% - For a continuous flow type of sedimentation tanks__________________?
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 - Skimming tanks are__________________?
A. Used to remove the grease and oil
B. Those from which sludge is skimmed out
C. Tanks provided with self- cleansing screens
D. Improved version of grit chambers - In a grit chamber of a sewage treatment plant ____________________?
A. Flow velocity 0.15 m to 0.3 m/sec is kept
B. Depth of 0.9 m to 1.20 m is kept
C. One minute of detention period is kept
D. All the above - The first stage of neutral process of sludge digestion, is__________________?
A. Acid fermentation
B. Acid regressio
C. Alkaline fermentation
D. None of these - The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is_____________________?
A. 204 cu.m
B. 208 cu.m
C. 212 cu.m
D. 216 cu.m - Sewer manholes are generally provided at________________?
A. The change of gradient
B. The change of direction
C. The junctions of sewers
D. All of these
