Which is TRUE concerning a fuel-air mixture...

Question 1 / 2707066636eec28f7522a1c51c830

Question 1 of 2707066636eec28f7522a1c51c830

Which is TRUE concerning a fuel-air mixture below the lower flammable limit?

Question 1 of 27070

Which is TRUE concerning a fuel-air mixture below the lower flammable limit?

🔍 Key Concepts

• Flammable range (between lower and upper flammable limits) • What happens if there is too little vs. too much fuel in air for combustion • Difference between rich and lean mixtures in combustion

💭 Think About

• Think about a campfire or gas stove: what happens if you add more and more fuel but don’t have enough air? What about the opposite? • The lower flammable limit is the minimum fuel concentration needed to burn. If you are below this point, are you short on fuel or short on air? • Match the everyday term (rich/lean) with the condition of having excess fuel or insufficient fuel in a fuel-air mixture.

✅ Before You Answer

• Confirm that below the lower flammable limit means there is less fuel than needed for ignition. • Review that a rich mixture has more fuel than needed, and a lean mixture has less fuel than needed. • Eliminate any choices that talk about the mixture being too dense or too cool, since the flammable limit is about concentration, not temperature or weight.

Question 1 of 27070

Which is TRUE concerning a fuel-air mixture below the lower flammable limit?

The mixture is too dense to burn

The mixture is too rich to burn

The mixture is too cool to burn

The mixture is too lean to burn