An toànCâu 336 / 360
Cal/OSHA sets a Permissible Exposure Limit (PEL) for hydrogen sulfide, a gas plumbers meet in sewers. Approximately what is the 8-hour PEL for H2S under Title 8?
a.500 ppm
b.100 ppm
c.10 ppm
d.There is no limit for H2S
Giải thích
Under Title 8 §5155 (airborne contaminants), the 8-hour permissible exposure limit for hydrogen sulfide is about 10 ppm, with a short-term ceiling that is higher. These limits are low because H2S is acutely toxic; concentrations of a few hundred ppm can cause rapid collapse. Plumbers working around sewage should monitor with a meter and never rely on odor alone.
Trích dẫn luật: Cal/OSHA Title 8 §5155Luyện miễn phí toàn bộ 360 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A plumber notices a rotten-egg smell while opening a sewer cleanout, then the smell fades. What toxic gas is this most likely, and why is the fading smell dangerous?
- The atmosphere in a sewer vault tests as oxygen-deficient. Before any worker enters, what is the required corrective action?
- A worker will descend into a deep sewer manhole. What retrieval equipment does Cal/OSHA generally require to aid non-entry rescue?
- A supervisor wants to skip the full permit process for a sewer entry by claiming the space is 'reclassified' as non-permit. Under Cal/OSHA, when is such reclassification allowed?
- The most reliable protection against backflow contaminating drinking water is a physical separation. What is an 'air gap' as defined for cross-connection control?
- A plumber is protecting the public water supply where a commercial boiler with chemical treatment connects to city water (a high-hazard, health-hazard cross-connection). Which backflow assembly is appropriate?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-36 Plumbing Trade Examination · Quy trình kiểm tra