The air supplied to a diesel engine is...

Question 1 / 270705eccefa1bacbc34ba4d47374

Question 1 of 270705eccefa1bacbc34ba4d47374

The air supplied to a diesel engine is compressed to __________. I. provide heat for the ignition of the fuel II. decrease injection delay

Back

Question 1 of 27070

The air supplied to a diesel engine is compressed to __________. I. provide heat for the ignition of the fuel II. decrease injection delay

🔍 Key Concepts

• Diesel engine combustion process – how ignition happens without spark plugs • Effect of air compression on temperature and ignition delay • Relationship between injection delay and cylinder pressure/temperature

💭 Think About

• Ask yourself: In a diesel engine, what actually causes the fuel to ignite once it is injected? Is it compressed air, compressed fuel, or a spark? • Think about what happens to air when it is compressed in a cylinder – what changes (pressure, temperature, density) and how each of those might affect ignition delay. • Consider whether higher pressure & temperature in the cylinder before injection would tend to shorten the time between start of injection and start of combustion, or make no difference.

✅ Before You Answer

• Verify the primary reason diesel engines compress only air on the compression stroke instead of an air-fuel mixture. • Check how increased air temperature from compression affects the ability of fuel to auto-ignite once injected. • Confirm what injection delay means: the time between start of injection and start of combustion, and how cylinder conditions (pressure/temperature) influence that delay.

Question 1 of 27070

The air supplied to a diesel engine is compressed to __________. I. provide heat for the ignition of the fuel II. decrease injection delay

I only is correct

II only is correct

both I and II are correct

neither I or II are correct

Question 1 / 270705eccefa1bacbc34ba4d47374

Question 1 of 270705eccefa1bacbc34ba4d47374

The air supplied to a diesel engine is compressed to __________. I. provide heat for the ignition of the fuel II. decrease injection delay

Back

Question 1 of 27070

The air supplied to a diesel engine is compressed to __________. I. provide heat for the ignition of the fuel II. decrease injection delay