A rigid closed tank contains refrigerant 134a wnich is initially a two-phase liquid - vapor muture with a temperaflure of o'c and a quality Of CG0% - An electrical resistor mistalled inside the Fank transfers until the tank contains only saturated vapor. if the tank is well - insulated and the mass of the refrigerant is 1.5 kg, determine the fime it takes for the process to be completed in seconds using 5 signifigant Agures.

T/F: The latent heat of vaporization is the energy required to change the state without changing the temperature.

Q1: In a nuclear reactor, heat is generated uniformly in the 5-cm-diameter cylindrical uranium rods at a rate of 7 x 107 W/m'. If the length of the rods is 1m, determine the rate of heat generation in each rod. Answer: Q=137.4 kW

Ms Png works on a piston-cylinder system which contains 0.05 m3 of nitrogen gasinitially at 200 kPa. At this state, a linear spring that has a spring constant of 150kN/m is touching the piston, but no force is exerting on it. Heat is then transferredto the nitrogen gas, causing the piston to rise and to compress the spring until thevolume inside the cylinder increases to 0.25 m3.a) Determine the final pressure inside the cylinder.b) Sketch the system on a P – V diagram.c) Calculate the total work done of the system.d) Deduce the work done against the spring to compress it.Given cross-sectional area of the piston = 0.25 m2Force applied by linear spring, F = kxk = spring constantx = displacement of the piston/spring