Question

The inlet and the outlet conditions of steam for an adiabatic steam turbine are as indicated in the notations are as usually followed.

Assume the above turbine to be part of a simple Rankine cycle. The density of water at the inlet to the pump is $1000kg/m^3$. Ignoring kinetic and potential energy effects. the specific work (in kJ/kg) supplied to the pump is

• A. 0.293
• B. 0.351
• C. 2.930
• D. 3.510

Answer 1

The correct option is C 2.930

(c)
Specific work supplied to the pump,
$w_p=v(p_1-p_2)kJ/kg$
where v is in $m^3/kg$
$p_{1}and{p}_{2}areinkPa$
$\therefore$ $w_p=\frac{p_1-p_2}{\rho }=\frac{3000-70}{1000}$
$=2.93kJ/kg$