The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will

The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will Decrease. The compression ratio is the ratio of the volume of the cylinder and the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top. Automotive engineers can improve fuel efficiency and fuel economy by designing engines with high compression ratios.