Question 1 of 27070
Q
The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of the ignition delay period. What else will influence the pressure rise?
A
Turbulence of the air charge
B
Volumetric efficiency
C
Fuel efficiency
D
Valve overlap
Question 1 / 270705eccefa1bacbc34ba4d4740d
Question 1 of 270705eccefa1bacbc34ba4d4740d

The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of the ignition delay period. What else will influence the pressure rise?

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Question 1 of 27070
Q

The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of the ignition delay period. What else will influence the pressure rise?

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🔍 Key Concepts

• Ignition delay period and how it affects the amount of fuel that has accumulated before combustion starts • How mixture formation and combustion quality change the speed and intensity of pressure rise in the cylinder • The role of air motion inside the cylinder in breaking up fuel droplets and mixing fuel and air

💭 Think About

• Which option is directly related to how well fuel and air are mixed at the moment of ignition? • Which choices are more about overall engine performance (like how much air gets in or how efficient the cycle is) rather than the instantaneous pressure rise right after ignition? • Think about what inside the cylinder can make combustion happen more quickly and uniformly once the fuel actually lights off.

✅ Before You Answer

• Identify which choice affects in‑cylinder mixing and flame spread during combustion, not just air quantity or timing. • Separate long‑term/overall measures like efficiencies from short, rapid events like the initial combustion phase. • Ask: which factor can increase the speed of combustion immediately after ignition, making the pressure rise steeper?