Regenerative gas refrigeration cycle: Pressure Ratio = 5, Compressor inlet temp. = 00C, Turbine inlet temp. = - 800C, Regenerator inlet (from the compressor side) temp. = 350C, Efficiency of the turbine = 85% and the efficiency of the compressor = 80%. Consider constant specific heats with Cp = 1.005 kJ/kg. K, k = Cp/Cv =1.4. Determine: (a) The effectiveness of the regenerator, (b) the heat removal in kJ/kg, and (c) the COP of the cycle. Also, find the Refrigeration load in kJ/kg and the COP for a simple refrigeration cycle with rp = 5, compressor inlet temperature of 00C and turbine inlet temperature of 35oC

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented