試題詳解

10. What concentration of flammable vapor should activate the alarms of fixed vapor detection system stipulated in IGC Code (International Gas Carrier Code)?
(A) When the vapor concentration reaches 10% of the lower flammable limit.
(B) When the vapor concentration reaches 20% of the lower flammable limit.
(C) When the vapor concentration reaches 30% of the lower flammable limit.
(D) When the vapor concentration reaches 40% of the lower flammable limit.