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The outlet pipe in the septic tank is kept about _________ lower than the inlet pipe.(a) 5 cm(b) 10 cm(c) 15 cm(d) 30 cmThe question was asked at a job interview.I want to ask this question from Systems of Plumbing in chapter Plumbing for Buildings of Construction & Building Materials

Answer»

The correct choice is (C) 15 CM

For explanation I would say: A septic tank is used for the TREATMENT of sewage from an isolated group of country houses where a public SEWER is not available. The OUTLET pipe in the septic tank is kept about 15 cm lower than the inlet pipe.



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