The thermal efficiency of an air-standard Brayton cycle in terms of pr

1.	The thermal efficiency of an air-standard Brayton cycle in terms of pressure ratio r
A.	<table><tr><td rowspan="2"> 1 </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">r<sub> </sub><sup> -1</sup></td></tr></table>
B.	<table><tr><td rowspan="2"> 1 </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">r<sub> </sub><sup> </sup></td></tr></table>
C.	<table><tr><td rowspan="2"> 1 </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">(r<sub> </sub>)<sup>1/<sub> </sub></sup></td></tr></table>
D.	<table><tr><td rowspan="2"> 1 </td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">r<sub> </sub><sup> -1/<sub> </sub></sup></td></tr></table>
Answer» E.

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The thermal efficiency of an air-standard Brayton cycle in terms of pressure ratio r

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