QUESTIONS

$(40\backslash \%)1.$ Steam enters a steady$-$flow turbine with a mass flow rate of $\backslash (26\backslash$mathrm$\{$~kg$\}/\backslash$mathrm$\{$s$\}\backslash )$ at $\backslash (600^\{\backslash$circ$\}\backslash$mathrm$\{$C$\},6\backslash$mathrm$\{$MPa$\}\backslash ),$ and a negligible velocity. The steam leaves the turbine at $0\mathrm{.}5$ MPa and $\backslash (250^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ where $15$ percent of the steam is removed for some other use. The remainder of the steam continues to expand to the turbine exit where the pressure is $10$ kPa and quality is $90$ percent. If the turbine is adiabatic, determine the rate of work done by the steam during this process.

$(40\backslash \%)2.$ A piston$-$cylinder device initially contains $\backslash (0\mathrm{.}3-\backslash$mathrm$\{$kg$\}\backslash )$ steam at $1\mathrm{.}0$ MPa $,$ and $\backslash (400^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash ).$ Now the steam loses heat to the surroundings and the piston moves down. hitting a set of stops at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at $\backslash (170^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash ).$ Determine $($a$)$ the final pressure and the quality $($if mixture$),($b$)$ the boundary work, $($c$)$ the amount of heat transfer when the piston first hits the stops, $($d$)$ and the total heat transfer.

Hint:Use Sonntag Thermodynamic Table