The pressure and temperature at the beginning of compression of an air-standard diesel cycle are 95 kpa and 300 k, respectively. at the end of the heat addition, the pressure is 7.2 mpa and the temperature is 2150 k. determine (a) the compression ratio. (b) the cutoff ratio. (c) the thermal efficiency of the cycle. (d) the mean effective pressure, in kpa.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]