Question $7$

If an ideal power cycle operates between $77C$ and $877C,$ what is its maximum efficiency?

$0\mathrm{.}7$

$0\mathrm{.}3$

$2\mathrm{.}3$

$1\mathrm{.}44$

Question $8$

If an ideal refrigeration cycle operates between $75F$ and $100F.$ What is the maximum coefficient of performance?

$4$

$3$

$22\mathrm{.}4$

$21\mathrm{.}4$

Question $9$

A pump takes in water at $0\mathrm{.}5MP{a}_{1}400K$ and reversibly and adiabatically increases the pressure to $1\mathrm{.}4$ MPa $.$ The density is $900k\frac{g}{m^3}.$ What is the work done?

$8100$

$8\mathrm{.}1$ es

$10000$

$1000$