engineering recuitment Punjab SSSB Jr Draftsman Civil Mock Test 2021 Environmental Engineering Quality of Water
In sanitary plumbing of buildings, a two-pipe system signifies
1
separate soil-pipe and waste pipe without vent pipes
2
a soil cum waste pipe and a ventilating pipe
3
separate soil and waste pipe and a common ventilating pipe
4
separate soil pipe and waste pipe, each with its own vent pipe