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QUESTION 2 Air at a pressure of 653 kPa and a temperature of 747 °C is expanded in a convergent- divergent nozzle to an isentropic temperature of 477 °C at a rate of 240 kg/min. The velocity of the air at the throat is 584,55 m/s. The isentropic efficiency of the nozzle is 90%. Take the Cp for air as 1,005 kJ/kg. °C and R as 0,287 kJ/kg.°C. Ignore the velocity of the air at the inlet. Calculate: 2.1 The absolute temperature of the air at the throat (2) 2.2 The value of gamma (2) 2.3 The pressure at the throat in kPa (2) 2.4 At the exit: 2.4.1 The pressure in kPa 2.4.2 The absolute actual air temperature 2.4.3 The velocity of the air in m/s 2.4.4 The specific volume of the air 2.4.5 The area in mm2 2.4.6 The diameter in mm (6 x 2) (12) 2.5 The volume of air passing the throat in m/s (2) [20]