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Option 3 : Otto cycle
Explanation:
Otto cycle:
The air-standard-Otto cycle is the idealized cycle for the spark-ignition internal combustion engines.
Otto cycle is the one which has two constant volume heat transfer processes and two adiabatic work transfer processes.
The Otto cycle 1-2-3-4 consists of the following four processes:
- Process 1-2: Reversible adiabatic compression of air
- Process 2-3: Heat addition at constant volume
- Process 3-4: Reversible adiabatic expansion of air
- Process 4-1: Heat rejection at constant volume
only work transfer taken place but no heat transfer occurs.
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