Answer:
Otto cycle for 4 stroke engine:
Assumptions:
1.Air is a working fluid it will behave like ideal gas.
2.Mass of air is constant(close system)
3.All process is reversible process.
4.Specific heat of air does not depends on temperature.
4 stroke engine is an internal combustion engine.It works on 4 processes like intake ,compression,power and heat exhaust.To complete one cycle ,piston moves from top dead center to bottom dead center two times.
From the Otto cycle
Process 1-2 is isentropic compression.
Process 2-3 is heat addition.
Process 3-4 is isentropic expansion.
Process 4-1 is heat rejection.
Petrol engine works on Otto cycle.
Efficiency of cycle [tex]\eta[/tex]
[tex]\eta=\dfrac{W_{net}}{Q_{supply}}[/tex]
