Which of the following statements is true regarding the state of the working flu

Question

Which of the following statements is true regarding the state of the working fluid in a typical Brayton cycle application? The working fluid begins as a sub-cooled liquid; heat is added until the working fluid is converted to a saturated vapor; the working fluid is expanded to an intermediate quality in a turbine, and then condensed back to a saturated vapor The working fluid begins as a sub-cooled liquid; it is heated in a burner until it reaches supercritical state, after which it is expanded isentropically to an intermediate quality through a turbine, and then condensed back to a saturated vapor The working fluid is a saturated liquid throughout The working fluid is gas throughout

Explanation / Answer

Brayton cycle is a simple GAS trubine cycle. The working fluid in this cycle is AIR. In this, first air is compressed adiabatically. Then it enters the combustion chamber where fuel is injected into this compressed air. Then the products of combustion expand through the turbine and thrown out to the surrounding air.

Therefore, throughout the process, the working fluid (air) is in gaseous state only. Thus, the correct answer is OPTION-D.

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