One steel cylinder is shrunk onto another. the compound cylinder has an inside diameter of 120mm, an outside diameter of 240mm and a diameter of 180mm at the surface of contact. the shrinkage produces a radial pressure p at the surfaces in contact. after the compound cylinder is subjected to an internal pressure pi, find the ratio of p to pi so that the maximum hoop stress in the two cylinders would be the same.

Abrayton cycle operates with a regenerator on the air-standard with properties evaluated at 400 k. the tem- perature of the air entering the compressor is 350k while the temperature of the air exiting the compressor is 600 k. the temperature of the air entering the turbine is 1600 k. the overall cycle produced 600 kj/kg of net work out. assuming a regenerator effectiveness of 0.8, what is the temperature of the air before heat addition (combustion)? draw this process on a t - s diagram