Cấp nước & Phân phốiCâu 37 / 360
What is the essential difference between back-siphonage and backpressure backflow?
a.Back-siphonage is caused by negative (sub-atmospheric) pressure in the supply, while backpressure is caused by downstream pressure exceeding supply pressure
b.They are identical
c.Back-siphonage requires a pump; backpressure never does
d.Backpressure only occurs in drainage systems
Giải thích
Back-siphonage results from negative pressure (a partial vacuum) in the supply pulling water backward, while backpressure occurs when downstream pressure exceeds the supply and pushes water backward. They are not identical, back-siphonage does not require a pump, and backpressure occurs in pressurized water systems, not just drainage.
Trích dẫn luật: 2022 California Plumbing Code (CPC) §603.0Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
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