Question 626Deck Safety70% to pass
A fuel-air mixture below the lower explosive limit is too _______________.
AI Explanation
The correct answer is D) lean to burn.
A fuel-air mixture that is below the lower explosive limit is considered too lean to burn. The lower explosive limit (LEL) is the minimum concentration of a flammable vapor or gas in air below which the mixture will not ignite. If the fuel-air mixture is below the LEL, it contains too little fuel to support combustion, making it too lean to burn.
The other options are incorrect because:
A) A mixture that is too dense would actually be too rich to burn.
B) The temperature of the mixture is not the issue - the mixture is simply too lean to ignite.
C) A mixture that is too rich would contain too much fuel, not too little.
Related Questions
#624 The minimum concentration of a vapor in air which can form an explosive mixture is called the _______________.#625 Accumulations of oily rags should be _______________.#627 The midships house of your break bulk ship is constructed with an interior stair tower from the main deck to the bridge. Under what circumstances may the doors from each deck to the stair tower be kept open when underway? #628 In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by _______________.#629 Fire may be spread by which means?