The ignition quality of diesel fuel becomes...

Question 1 / 205eccefa2bacbc34ba4d47785

Question 1 of 205eccefa2bacbc34ba4d47785

The ignition quality of diesel fuel becomes LESS critical as __________.

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Question 1 of 20

5eccefa2bacbc34ba4d47785

The ignition quality of diesel fuel becomes LESS critical as __________.

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🔍 Key Concepts

• Cetane number and what it indicates about diesel fuel ignition quality • Relationship between engine speed (high vs low speed diesels) and required ignition quality • How time available for combustion in the cylinder changes with engine RPM

💭 Think About

• Think about whether high-speed or low-speed diesel engines have more time for the fuel to ignite after injection. • Ask yourself: in which case can the fuel have slightly poorer ignition quality and still burn satisfactorily because of the timing available? • Consider which design change would give the fuel spray more crank angle degrees and milliseconds before peak pressure is needed.

✅ Before You Answer

• Be clear on what "ignition quality" means for diesel (how quickly it auto-ignites after injection). • Compare how the ignition delay time fits into one engine cycle at high vs. low RPM. • Ignore options that deal with things that do NOT directly change the time between injection and required combustion, such as lube oil additives.

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Question 1 of 20

The ignition quality of diesel fuel becomes LESS critical as __________.

lube oil additives are increased

designed piston speeds are increased

designed injection pressures are decreased

designed engine speeds are decreased

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Question 1 / 205eccefa2bacbc34ba4d47785

Question 1 of 205eccefa2bacbc34ba4d47785

The ignition quality of diesel fuel becomes LESS critical as __________.

Back

Question 1 of 20

5eccefa2bacbc34ba4d47785

The ignition quality of diesel fuel becomes LESS critical as __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed