In an air standard diesel cycle, the compression ratio is 15, and at the beginning of isentropic compression, the temperature is 27°c and the pressure is 0.1 mpa. heat is added until the temperature at the end of the constant pressure processis 1450°c. for air, take cp1.005 kj/kg k and c, 0.718 kj/ kg k. calculate (a) the cut-off ratio. (b) the heat supplied per kg of air. (c) the cycle efficiency. (d) the mean effective pressure in kpa.