Steam with initial parameters p1 = 0.1 MPa and t1 = 390 °C was expanded isentropically to a pressure of 0.03 MPa and then heated isobarically, providing 472 kJ/kg of heat. Determine the parameters of the steam (p, v, t, h, s, x) in the characteristic states of transformations. Draw the graphical ill

The following table of properties was printed out for saturated liquid and saturated vapor of ammonia. The titles for only the first two columns are available. All that we know is that the other columns (columns 3 to 8) contain data on specific properties, namely, internal energy (kJ/kg), enthalpy (

Answer: In many cyclic devices, the working fluid undergoes a transformation at some stages in which it converts from liquid to vapor or vice versa. This transformation is called phase change. For example, liquid water changes its phase from liquid to vapor(steam) in the boiler in a steam power p

Answer: An ideal gas is an imaginary substance that obeys the relation Pv = RT. At low pressures and high temperatures, the density of a gas decreases, and the gas behaves as an ideal gas under these conditions. In the range of practical interest, many familiar gases such as air, nitrogen, oxyge

Nitrogen at an initial state of 10 bar, 1 m3, and 300 K is expanded isothermally to a final volume of 2 m3. The p-v-T relation is (p+a/v^2)v=RT, where a>0. The final pressure _______ A. will be slightly less than 5 bar B. will be slightly more than 5 bar C. will be exactly 5 bar D. cannot be ascert

Answer: Let's apply the energy balance equation between the upstream and downstream of the throttling valve. Q + h1= W + h2 + d(KE) + d(PE) Q = 0 Reason: There is not enough time and surface area available for heat transfer W = 0 Reason: There is no lifting of any weight (no thermodynamic wor

Given below is an extract from steam tables. Specific enthalpy of water in kJ/kg at 150 bar and 45 C is A. 203.60 B. 200.53 C. 196.38 D. 188.45

The Vander-Waals equation of state is (p+a/v^2)(v−b)=RT, where p is pressure, v is specific volume, T is temperature, and R is the characteristic gas constant. The SI unit of a is __________ A. J/kg-K B. m^3/kg C. m^5/kg−s^2 D. Pa/kg