Engineering Board Exam Reviewer · Thermodynamics · easy

In the dual (limited-pressure) cycle, heat is added:

1. Entirely at constant volume
2. Partly at constant volume and partly at constant pressure
3. Entirely at constant pressure
4. Entirely at constant temperature

Answer

B. Partly at constant volume and partly at constant pressure

Solution

The dual (Sabathé) cycle better models actual high-speed compression-ignition engines.

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10. Gay-Lussac's law states that for a fixed mass of gas at constant volume:

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