Question 726 Deck Safety

The correct answer is C) lower explosive limit. Combustible gas indicators measure the presence of combustible gas as a percentage of the lower explosive limit (LEL). The LEL is the minimum concentration of a gas or vapor in air below which the mixture will not ignite or explode. Combustible gas indicators are designed to detect the presence of flammable gases and provide a reading as a percentage of the LEL, allowing operators to monitor and prevent potentially hazardous conditions. The other options are incorrect because the fire point and flash point are characteristics of a liquid fuel, not a measurement of gas concentration, and the upper explosive limit (UEL) is the maximum concentration of a gas or vapor in air above which the mixture will not ignite or explode.