a) Certain type of motor is used to drive a compressor so that 100 ķPa, 280 K of air is compressed steadily to 600 kPa, 400 K. Considering two different types of motor as below: Heat loss Motor X 45.6 kJ/kg 57 kJ/kg Air Flow Rate 0.03 kg/s 0.045 kg/s Motor Y Assuming the changes in kinetic and potential energies are negligible, evaluate the use of which motor is more preferable with the consideration of the work input that has to be supplied to the system.

Steam turbine Wout P2 X2 = 1.0 V2 Steam enters a well-insulated turbine at 3.5 MPa and T,°C with a velocity of 130 m/s. At the exit, water is saturated vapor at 30 kPa and the velocity is 220 m/s. What should be inlet temperature T1, in °C, if work generated by turbine (wout) is 700 kJ/kg.

Q3: Air undergoes a three-process cycle. if the processes are :1→ 2: constant- pressure expansion .2→ 3: constant volume 3 → 1: constant-temperature compression .The necessary information is T1 = 100°C, T2 = 600°C, and P1 = 200 kPa. R=0.287 KJ/kg.K 1) Find the net work done for 1 kg A: 32.5 KJ B: 42.5 KJ C: 52.5 KJ D: 62 KJ