Special Problem #5: A freight truck operates on an air-standard Diesel cycle which has a compression ratio of 18:1. At the beginning of the compression process the pressure is 1 bar and the temperature 30 C. The maximum temperature in the cycle is 2250 K. Do not assume constant specific heats. a. Calculate the cutoff ratio. b. Determine the net specific work of the cycle, in kJ/kg. c. Calculate the thermal efficiency of the cycle. d. Find the mean effective pressure, in kPa. e. Plot the cycle on P-v and T-s diagrams.