For a given fuel, a change in the...

Question 1 / 205eccefa1bacbc34ba4d4740b

Question 1 of 205eccefa1bacbc34ba4d4740b

For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?

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Question 1 of 20

5eccefa1bacbc34ba4d4740b

For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?

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🔍 Key Concepts

• Compression ratio and its effect on peak compression temperature and pressure in a diesel engine cylinder • Meaning of ignition lag (ignition delay) in relation to fuel injection and start of combustion • How higher air temperature at the end of compression affects the time needed for fuel to ignite

💭 Think About

• Think about what happens to the temperature of the air in the cylinder when the compression ratio is increased versus decreased. • If the air is hotter when the fuel is injected, will the fuel need more time or less time to reach self-ignition conditions? • Look at which answer choices correctly keep cause and effect in the right direction: does compression ratio change ignition lag, or does ignition lag change compression ratio?

✅ Before You Answer

• Be sure you know that ignition lag is the time between start of injection and start of combustion. • Confirm that increasing compression ratio raises the final compression temperature for the same fuel and engine speed. • Eliminate any options where the direction of cause and effect is reversed (for example, ignition lag affecting compression ratio).

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Question 1 of 20

For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?

A decrease in compression ratio will decrease the ignition lag.

An increase in compression ratio will increase the ignition lag.

An increase in compression ratio will decrease the ignition lag.

A decrease in ignition lag will increase the compression ratio.

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Question 1 / 205eccefa1bacbc34ba4d4740b

Question 1 of 205eccefa1bacbc34ba4d4740b

For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?

Back

Question 1 of 20

5eccefa1bacbc34ba4d4740b

For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?

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