SUBJ: THERMODYNAMICS

1. A piston - cylinder containing steam at 800 kPa and 355 deg C undergoes a constant pressure process until the quality is 80%. Determine per kilogram (a) change of internal energy and (b) change of enthalpy. 2. 2.13 kg of steam at 315.C and with enthalpy of 2300 KI/kg is confined in a rigid container. Heat is applied until the steam becomes saturated. Determine the heat added in BTU. 3. Water at 2.5 MPa and 200'C is heated at constant temperature up to a quality of 80%. Find (a) the quantity of heat received by the water, (b) the change in internal energy, and (c) the work of a nonflow process. 4. Three kg of steam has an initial enthalpy of 7200 kl at 0.145 MPa. Isentropic compression gives a final pressure of 0.3 MPa. Find (a) the initial and final temperature and (b) the work of a steady and nonflow processes