QUESTION $5$

"A heat engine receives heat from a source at $850$ C and rejects the waste heat to a sink at $40$ C $.$ If heat is rejected from this engine at a rate of $80\frac{k}{s}.$ the maximum power $($ kW $)$ this heat engine can produce is$?"$

QUESTION $6$

"Steam is compressed from $4$ MPa and $500$ C to $9$ MPa isentropically$.$ The final temperature $($in C $,$ to the nearest $50$ degrees, such as $150$ or $200)$ of the steam is $?"$

QUESTION $7$

Argon gas $($ideal gas$)$ is compressed from $170$ kPa and $25$ C to a pressure of $750$ kPa adiabatically. The temperature $($in C$)$ of the argon gas after compression is $($use $k=1\mathrm{.}667)?$