When a generator diesel engine is operated...

When a generator diesel engine is operated...

Question 1 of 270705eccefa1bacbc34ba4d47419

When a generator diesel engine is operated at partial load, as compared to full load, a decrease will occur in the average __________.

Question 1 of 27070

Q

When a generator diesel engine is operated at partial load, as compared to full load, a decrease will occur in the average __________.

🔍 Key Concepts

• How engine piston speed is determined and what variables affect it • What changes in the combustion space between full load vs partial load operation • The difference between compression pressure (before firing) and combustion pressure (during the power stroke)

💭 Think About

• Which of these four items is directly related to engine RPM, and does load normally change RPM on a generator set? • At partial load, is there more or less fuel injected per cycle, and how does that affect the pressure developed during the power stroke? • Does simply changing the load on the generator, without changing RPM, significantly change the maximum pressure reached during compression before injection?

✅ Before You Answer

• Identify which options are mainly a function of mechanical speed (RPM and stroke) versus fuel quantity and burning • Separate in your mind compression stroke (air only, before fuel) from power stroke (after fuel burns) • Assume a typical generator diesel where speed is governor-controlled to stay nearly constant with changing electrical load. Use that to eliminate at least one or two choices.