Discussion
What is called to the ratio of thermal efficiency of actual cycle and the ideal cycle?
Answer: D
The ratio of the thermal efficiency of the actual cycle to that of the ideal cycle is called the relative efficiency. Mechanical efficiency is the ratio of brake power to indicated power, indicated thermal efficiency is the ratio of the indicated power to the fuel energy, and volumetric efficiency is the ratio of the volume of air actually drawn to the swept volume, so none of them is the ratio of actual to ideal thermal efficiency.
Relative efficiency is always below 1, since the actual cycle has losses that the ideal cycle does not have.
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