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An ideal gas, CP = ( 7 / 2 ) R and CV = ( 5 / 2 ) R , undergoes a cycle consisting

An ideal gas, CP =(7/2)R and CV =(5/2)R, undergoes a cycle consisting of the following mechanically reversible steps:
An adiabatic compression from P1, V1, T1 to P2, V2, T2
An isobaric expansion from P2, V2, T2 to P3= P2, V3, T3
An adiabatic expansion from P3, V3, T3 to P4, V4, T4
A constant-volume process from P4, V4, T4 to P1, V1= V4, T1
Determine its thermal efficiency if T1=250\deg C, T2=1000\deg C, and T3=1700\deg C.
The thermal efficiency is
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