Steam at a pressure of 15 bar and a temperature of 320oc is contained in a large vessel. connected to the vessel through a valve is a turbine followed by a small initially evacuated tank with a volume of 0.6 m3. when emergency power is required, the valve is opened and the tank fills with steam until the pressure is 15 bar. the temperature in the tank is then 400oc. the filling process takes place adiabatically and kinetic and potential energy effects are negligible. determine the amount of work developed by the turbine, in kj.

The process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy is nuclear

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)