301 Sample_Final_Test

301 Sample_Final_Test - SAMPLE MAE 301 Engineering...

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SAMPLE 1 MAE 301: Engineering Thermodynamics I Spring 2010 Final Test (30% of final grade) May 11, 2009 Problem 1. (25 points) A two-phase, liquid-vapor mixture of H 2 O, initially at x = 30% and a pressure of 100 kPa is contained in a piston-cylinder assembly. The piston diameter is 15 cm. The pressure of surroundings is 100 kPa. As the water is heated, the pressure inside the cylinder remains constant until the piston hits the stops. Heat transfer to the water continues at constant volume until the pressure is 150 kPa. Friction between the piston and the cylinder wall and kinetic and potential energy effects are negligible. For the overall process of the water, determine the work and heat transfer, each in kJ. Problem 2. (25 points) Air enters a compressor operating at steady state at pressure of 1 bar, a temperature of 290 K, and a velocity of 6 m/s through an inlet with an area of 0.1 m 2 . At the exit, the pressure is 7 bar, the temperature is 450 K, and the velocity is 2 m/s. Heat transfer from the

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301 Sample_Final_Test - SAMPLE MAE 301 Engineering...

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