Steam at $30$ bar and $400$C enters a convergent $-$ divergent Nozzle, and is expanded to a discharge pressure of $10$ bar. Assuming friction less flow up to throat, and Nozzle efficiency of $80\%,$ determine the $($a$)$ Exit velocity of Nozzle $($b$)$ Steam flow rate for a throat area of $25$ cm$2($C$)$ Exit diameter of Nozzle. Represent the Nozzle process on T$-$s and h$-$s diagram.