Question:
In an ideal thermodynamic cycle for compression-ignition (engines) heat is added at
In an ideal thermodynamic cycle for compression-ignition (engines) heat is added at
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Constant Volume = Petrol (Otto). Constant Pressure = Diesel.
Updated On: May 5, 2026
- Constant Pressure
- Constant Volume
- Constant Cooling
- Constant Temperature
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The Correct Option is A
Solution and Explanation
Step 1: Concept
The Diesel cycle is the ideal cycle for compression-ignition (CI) engines.
Step 2: Meaning
In this cycle, air is compressed to a high temperature, and fuel is injected, igniting spontaneously.
Step 3: Analysis
Unlike the Otto cycle (petrol), where heat is added at a constant volume, the ideal Diesel cycle assumes heat addition (combustion) occurs at a constant pressure as the piston moves down.
Step 4: Conclusion
Therefore, heat is added at constant pressure.
Final Answer: (A)
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