Answer
Option (d) $1.76$ MW
Work Step by Step
Solved by EES Software. Solutions can be verified by copying-and-pasting the following lines on a blank EES screen:
$C_p=0.5203$
$k=1.667$
$P_1=3000$ "kPa"
$T_1=750+273$ "K"
$m=5$ "kg/s"
$P_2=200$ "kPa"
"$s_2=s_1$"
$T_2=T_1*(P_2/P_1)^{(k-1)/k}$
$W_{\text{max}}=m*C_p*(T_1-T_2)$
Option (d) $1.76$ MW is correct.
