An air standard diesel cycle has a compression ratio of 18. air is at 300k and 100 kpa at the beginning of the process and 1500k at the end of the heat addition process. accounting for the variation in specific heats with temperature, determine (a) the cutoff ratio, (b) heat rejected per unit mass, and (c) the thermal efficiency.

Nitrogen (n2) undergoes an internally reversible process from 6 bar, 247°c during which pν1.2 = constant. the initial volume is 0.1 m3 and the work for the process is 121.14 kj. assuming ideal gas behavior, and neglecting kinetic and potential energy effects, determine heat transfer, in kj, and the entropy change, in kj/s. show the process on a t-s diagram.