Discussion
Consider the following statements about isentropic efficiency.
1. For a turbine it is actual work divided by isentropic work.
2. For a compressor it is isentropic work divided by actual work.
3. It can exceed unity for a well designed machine.
Answer: A
The first two are correct and reflect that the ideal is the best case in each direction. The third is impossible, because the isentropic path is the limit that no real adiabatic machine can beat. Values above ninety per cent are considered very good.
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