In which of the following cycles does heat addition not take place at constant volume?

🔑 Key Points
🛠️ Concept of Diesel Cycle:
→ The Diesel Cycle is also called a constant pressure cycle because heat is supplied at constant pressure.
→ The processes in the Diesel Cycle are as follows:
→ Process 1-2: Isentropic compression.
→ Process 2-3: Constant pressure heat addition.
→ Process 3-4: Isentropic expansion.
→ Process 4-1: Constant volume heat rejection.