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Draw dual cycle on P V and T S diagram and write the processes involved in it. 
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1-2 Isentropic compression of air

 2-3 the combustion of fuel at constant volume.

 3-4 the combustion of fuel at constant pressure

 4-5 Isentropic expansion during which work is done by the system.

 5-1 Heat rejection at constant volume. 

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