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Identify the air-standard cycle from its process set Processes: one constant-pressure process, one constant-volume process, and two isentropic (reversible adiabatic) processes. Choose the correct cycle name.

Difficulty: Easy

Carnot cycle
Stirling cycle
Otto cycle
Diesel cycle

Correct Answer: Diesel cycle

Explanation:

Concept/Approach

Diesel cycle: isentropic compression → constant-pressure heat addition → isentropic expansion → constant-volume heat rejection.
Otto: two isentropes + two constant-volume processes.
Carnot: two isotherms + two isentropes. Stirling: two isotherms + two constant-volume processes with regeneration.

Final Answer
Diesel cycle

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