🔍 Key Concepts

• how diesel engines ignite fuel without spark plugs • effect of temperature on fuel ignition and air compression • methods used on ships to assist cold starting of large diesels

💭 Think About

• Which choices would make it easier for air in the cylinder to reach ignition temperature during compression? • Is higher or lower compression better for creating heat in the air charge? • Which option reflects a common shipboard practice for preparing main and auxiliary engines in very cold conditions?

✅ Before You Answer

• Eliminate any option that would reduce heat in the cylinder at the moment of injection. • Think about what systems (fuel, air, cooling water) can be adjusted to raise temperature instead of lower it. • Ask which option aligns with standard pre‑start procedures in cold climates for marine diesels.