During rapid recharging cycles, industrial lead-acid battery banks produce volatile hydrogen gas through the electrolysis of water within the electrolyte solution. Facility safety guidelines mandate continuous mechanical ventilation to maintain hydrogen concentrations below one percent of total room volume, well under the four-percent lower explosive limit. If exhaust fans fail, backup airflow sensors automatically interrupt the charging current to prevent hazardous gas pockets from accumulating near the ceiling. Technicians must never override these electrical interlocks during routine system diagnostics, as even minor electrical arcing from testing probes can trigger a combustion event when flammable vapor is present.
Based on the passage, which of the following describes the safeguard triggered by a breakdown in primary air circulation?
- AMechanical ventilation is programmed to activate only after the proportion of hydrogen gas exceeds four percent of room capacity.
- Power delivery to the battery cells is halted by secondary monitors whenever the ventilation equipment ceases operating.Answer
- CTesting probes generate volatile hydrogen gas through the electrolysis of the electrolyte solution during routine system diagnostics.
- DThe buildup of elevated gas concentrations causes the safety mechanisms to shut down the room's exhaust fans.