Air enters an adiabatic nozzle at 230 kPa, 600°C with a velocity of 60 m/s. The air is at 70 kPa, 450°C at the exit of the nozzle. Model the air as an ideal gas having variable specific heat, using values from Cengel's tables posted on Canvas. a) Find the exit velocity of the air (answer: 577.1 m/s). b) Find the isentropic efficiency of the nozzle (answer: 0.643).

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This is an Isothermal Compression of Ammonia [not an ideal gas] Ammonia in a piston-cylinder device initially at 700kPa, 303K undergoes a reversible isothermal compression process until the volume is reduced to 25% of the initial volume. a)  Draw the process T-s and p-v-diagrams, relative to saturation lines. b)  What is the heat and work per unit mass?

Steam is expanded isentropically in a turbine from 800 kPa, 250 °C to 200 kPa. How much work is done in this process per kg of water?