The power/expansion stroke shown in the...

Question 1 / 2707066636eef28f7522a1c5200cc

Question 1 of 2707066636eef28f7522a1c5200cc

The power/expansion stroke shown in the illustration is indicated by the diagram numbers __________. Illustration MO-0025

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Question 1 of 27070

The power/expansion stroke shown in the illustration is indicated by the diagram numbers __________. Illustration MO-0025

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

🔍 Key Concepts

• Review the four strokes of a diesel engine: intake, compression, power (expansion), and exhaust • During the power/expansion stroke, the piston is moving downward after fuel ignition, and both intake and exhaust valves should be closed at first • Notice when fuel injection ends and when the exhaust valve begins to open as the piston approaches the bottom of the stroke

💭 Think About

• Identify in which figure(s) the piston is just starting to move down from top dead center with combustion pressure acting on it • Look at each figure and decide whether it shows compression (piston moving up with valves closed) or expansion (piston moving down after firing) • Determine at which figure the exhaust valve starts to open, marking the end of the power stroke

✅ Before You Answer

• Verify in the chosen sequence that the crank position changes continuously through a single downward stroke of the piston • Confirm that for all figures in your chosen range the piston is moving downward and cylinder pressure is driving it (not being compressed) • Make sure your end figure is right before or at the point where the exhaust valve first opens, which signals the end of the power stroke

Question 1 of 27070

The power/expansion stroke shown in the illustration is indicated by the diagram numbers __________. Illustration MO-0025

1 through 3

1 through 4

3 through 6

4 through 6

Question 1 / 2707066636eef28f7522a1c5200cc

Question 1 of 2707066636eef28f7522a1c5200cc

The power/expansion stroke shown in the illustration is indicated by the diagram numbers __________. Illustration MO-0025

Back

Question 1 of 27070

The power/expansion stroke shown in the illustration is indicated by the diagram numbers __________. Illustration MO-0025

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