What would the Diesel cycle engine efficiency in Example 6.2 be if the cut-off ratio was reduced to 1.9?

Example 6.2

A new four-cylinder, four-stroke Diesel cycle engine with a compression ratio of 19.0 and a cut off ratio of 2.37 has a total displacement of 4.50 × 10^-3 m³ (4.50 liters). The engine burns kerosene with a heating value of 45,500 kJ/kg and has a mass air-to-fuel ratio of 30.0 kg-air/kg fuel. During a test, the intake air density was 1.20 kg/m³ when the engine was running at 2500. RPM and producing 33.1 horsepower. Determine (1) the efficiency of the engine, (2) the ideal power output of the engine, and (3) the mechanical efficiency of the engine.

Need: The engine’s efficiency, ideal power output, and actual power output.

Know–How: These results are given by Equations (6.6), (6.1), and (6.3).