The pressure-volume diagrams illustrated are...

Question 1 of 2707066636eef28f7522a1c5200ff

The pressure-volume diagrams illustrated are of four internal combustion engine cycles. Which one represents the theoretical diesel cycle? Illustration MO-0102

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Question 1 of 27070

The pressure-volume diagrams illustrated are of four internal combustion engine cycles. Which one represents the theoretical diesel cycle? Illustration MO-0102

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🔍 Key Concepts

• Compare Diesel vs Otto vs Dual cycles and how heat is added in each on a P–V diagram. • Remember that constant pressure lines are horizontal and constant volume lines are vertical on a P–V diagram. • In the ideal Diesel cycle, only the heat addition process is at (theoretically) constant pressure, while compression and expansion are isentropic curves.

💭 Think About

• On each diagram, identify which segment represents heat addition and decide whether it occurs at constant pressure or constant volume. • Check which diagrams show isentropic (curved) compression and expansion, with only one segment being a horizontal line during heat addition. • Ask yourself: in which option does the piston move (volume changes) while the pressure stays essentially constant during heat addition?

✅ Before You Answer

• Verify that the compression (1→2) and expansion (3→4 or 2→3) strokes are shown as smooth curves (isentropic), not straight vertical or horizontal lines. • Confirm that the heat addition portion of the cycle is represented by a horizontal line (constant pressure) with increasing volume. • Make sure the heat rejection process returns the cycle to the original state and may be shown as a vertical line (constant volume) on the correct Diesel diagram.