Question 1 In a centrifugal air compressor with air dryer, air flows at a constant rate of 1.88 kg/s and 33 m/s, with a specific volume of 0.57 m3/kg, internal energy of 65 kJ/kg and a pressure of 0.98 bar. Exit conditions include a speed of 195 m/s, a pressure of 8 bar, internal energy of 70 kJ/kg and a specific volume of 0.31 m/kg. During compression, heat is lost at a rate of 110 kJ/s. 1.1. Determine the power required to drive the compressor. [5 Marks] Question 2 The maximum and minimum pressures in a Carnot cycle operating between 527C and 27C are 33 MPa and 0.32 MPa, respectively. Given Cv, mass and y of 0.818 KJ/kg.K, 1.2 kg and 1.3 2.1. 2.2. Draw the Carnot cycle on a T-S diagram. Determine the thermal efficiency. Determine the work ratio. (3) (3) (14) [20 Marks] 2.3. Question 3 At a pressure of 6.5 bar, the Shosholoza steam plant in Soweto must produce a steam mixture of 78% quality. Determine: (4) (3) 3.1. 3.2. The enthalpy. The specific volume. The entropy. (3) 3.3. [10 Marks FBED F7 Ca FO F5 o F4 F3 F2 F1 & 8 %