QUESTION ONE

A$.$ Define the following terms as used in thermodynamics;

$($i$)$ Intensive property

$[2$ Marks$]$

$($ii$)$ Non$-$flow process

$[2$ Marks$]$

$($iii$)$ Enthalpy

$[2$ Marks$]$

B$.$ State the first law of thermodynamics and give its mathematical expression.

$[4$ Marks$]$

C$.$ In a turbine of a gas turbine unit the gases flow through the turbine at $17K\frac{J}{s}$ and the power developed by the turbine is $14,000kw.$ The specific enthalpies of the gasses at inlet and outlet are $1200K\frac{J}{k}g$ and $360K\frac{J}{K}g$ respectively, and the velocity of the gases at inlet and outlet are $60\frac{m}{s}$ and $150\frac{m}{s}$ respectively. Calculate;

$($i$)$ Rate at which heat is rejected from the turbine.

$[5$ Marks$]$

$($ii$)$ The area of the inlet pipe given that specific volume of gases at inlet is $0\mathrm{.}5\frac{m^3}{k}g.$

$[5$ Marks$]$

$($TOTAL $20$ Marks$)$