Apower cycle operating between two reservoirs receives energy qh by heat transfer from a hot reservoir at th = 2000k and rejects energy qc by heat transfer to a cold reservoir at tc = 400k. for each of the following cases determine whether the cycle operates reversibly, irreversibly, or is impossible:
a.) qh 1200 kj wcycle 1020 kj
b.) qh 1200 kj qc 240 kj
c.) wcycle 1400 kj qc 600 kj
d.) η 40%

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.