Which statement about diesel engine...

Which statement about diesel engine...

Question 1 of 270705eccefa1bacbc34ba4d474df

Which statement about diesel engine combustion is true?

Question 1 of 27070

Q

Which statement about diesel engine combustion is true?

🔍 Key Concepts

• Top Dead Center (TDC) and when peak pressure normally occurs in a diesel engine cycle • How fuel injection timing and compression ignition work in a diesel • The role of turbulence and air-fuel mixing in speeding up, not slowing down, combustion

💭 Think About

• Think about when fuel is injected in a diesel: is it injected so that peak pressure happens before, exactly at, or just after TDC? • If combustion did not begin until the piston was moving down, what would that do to engine efficiency and power? • Does turbulence in the combustion chamber generally promote faster ignition and better mixing, or does it cause ignition delay?

✅ Before You Answer

• Be clear on what happens just before TDC, at TDC, and just after TDC during the power stroke of a diesel • Consider the purpose of injection advance (starting injection before TDC) and what it is trying to line up with in the piston’s motion • Eliminate any choice that would clearly waste pressure by building it up when the piston is already moving away and volume is increasing rapidly