Question

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1. You are looking to see if an adiabatic expansion process is efficient or not. What tells you that it is most efficient? a) fast process b) polytropic process c) isentropic process d) slow process

Answer 1

An isentropic process (c) identifies the adiabatic expansion procedure that is the most effective.

Step-by-step explanation:

An isentropic process (c) denotes the adiabatic expansion method that is the most effective. As there is no heat exchange with the environment during an adiabatic expansion, there is no heat transmission into or out of the system. The degree of reversibility of the expansion process and the amount of work that may be extracted from the system both affect efficiency. A reversible adiabatic process with a constant entropy is known as an isentropic process. Because it reduces energy losses and increases work production, it is the optimum situation for optimal efficiency. When temperature and pressure both fall concurrently during an isentropic process, the expansion is quick and effective. A polytropic process (b), on the other hand, involves a change in entropy, making it less effective than an isentropic process. Efficiency in an adiabatic expansion is mostly determined by whether it follows an isentropic path or not, not by how rapidly or slowly the process is moving (a,d). In conclusion, an isentropic (c) adiabatic expansion process is the most effective because it optimizes work output and denotes that the process is reversible.

Answer 2

Step-by-step explanation:

The most efficient indicator for an adiabatic expansion process is that it is an isentropic process (option c). An adiabatic process is one in which no heat exchange occurs with the surroundings. In an isentropic process, not only is heat transfer negligible, but the process is also reversible, meaning there are no dissipative losses or irreversibilities.

In an isentropic adiabatic expansion, the system undergoes expansion while maintaining constant entropy. This implies that the process is thermodynamically efficient because it maximizes the utilization of available energy. Any departure from an isentropic path would result in additional entropy generation, indicating inefficiencies in the process.