q1)

q1b)

A system draws 1,109 Joules of heat from a thermal reservoir at the constant temperature of 396 Kelvin and rejects 895 Joules of heat to a thermal reservoir (heat sink) at the constant temperature of 375 Kelvin. Calculate the entropy change of the system in J/K to three significant figures and enter the numerical value only e.g. 0.123, 123, 123000, 0.0123, but not 0.0123 /K). Partial credit is awarded for a reasonable approximation to the correct numerical answer. 0.414? Flow enters a turbine at a specific enthalpy of 922 Jkg and expands adiabatically to a specific enthalpy of 801 J/kg. The equivalent isentropic expansion would see the flow expanding to 773 J/kg. Calculate the turbine Isentropic efficiency. State your answer as a real number to three significant figures (example: enter neither 12.3% nor 12.3 but 0.123). Partial credit is awarded for a reasonable approximation to the correct numerical answer. 0.8122