Which of the following types of sewers uses pipes that are manufactured by the hot process using clays and shales of special qualities and grades?
DSSSB JE - 2023,
Answer: A
Stoneware sewer pipes are made by firing selected clays and shales of special quality in a kiln, the hot process, and are glazed to give a smooth, impervious and corrosion-resistant surface. Brick sewers are built in place from bricks and mortar, plastic sewers are made from PVC or HDPE by extrusion, and asbestos cement sewers are made by mixing asbestos fibre and cement, so none of those is made from clay and shale in a kiln.
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