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sample%20midterms - Mechanical Engineering Thermodynamics...

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Mechanical Engineering Thermodynamics Mid-Term Examination Fall, 2003 1. A piston-cylinder device contains 50 Kg of water at 150 kPa and 25 0 C. The cross sectional area of the piston is 0.1 m 2 . Heat is now transferred to the water, causing part of it to evaporate and expand. When the volume reaches 0.2 m 3 , the piston reaches a linear spring whose spring constant is 100 kN/m. More heat is transferred to the water until the piston rises 20 cm more. Determine: a. The final pressure and temperature. b. The work done during the process. A=0.1 m 2 H 2 0 m=50 kg 2. Air enters a compressor operating at a steady state at a pressure of 100 kPa, a temperature of 290 0 K, and a velocity of 6 m/sec through an inlet with an area of 0.1 m 2 . At the exit, the pressure is 700 kPa, the temperature is 450 0 K, and the velocity is 2 m/sec. Heat transfer from the compressor to its surroundings occurs at a rate of 3 kJ/sec. Assuming the air is an ideal gas, calculate the power input to the compressor (in kW).

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