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MT1solution07 - ENGR 225 Name Recitation 8:30;10:15_1:15...

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ENGR 225 Name ___________________________ September 28, 2007 Recitation: 8:30___;10:15; ___1:15___ Short answer (2 pts. Each, for T/F and multiple choice circle the best answer of the choices given , fill in the blank must be completed with a meaningful word or phrase) 1. The science of energy, with a focus on its conversion between different forms, is _Thermodynamics_. 2. T F An imaginary surface can serve as a useful boundary between a system and its surroundings. 3. If mass cannot cross a system’s boundary, but energy can – it is termed a a) open system b) closed system c) isolated system d) control volume e) none of the above 4. Two examples of intensive properties are pressure and temperature. A third is_specific volume_. 5. T F All states are equilibrium states. 6. Types of equilibria include 7. The state of a simple compressible system is completely determined by ______two____ independent intensive variables. 8. T F The rate at which a process occurs does not affect the resultant thermodynamic state because thermodynamics is only concerned with energy changes not the rate of change. 9. When a process proceeds in such a manner that the system remains infinitesimally close to an equilibrium state at all times, it is called 10. The product ρ gh yields ____pressure__ and can have units of kJ/m 3 . 11. T F Internal energy changes as temperature and pressure change. 12. Terms that your book includes in determining the energy of a system include 13. Energy transfer into and out of a system include work and ___heat transfer_. 14. T F There is only one form of thermodynamic work.
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15. The difference between the “Total Energy Entering a System” and the “Total Energy Leaving a System” is the a) “Total Energy in a System” b) “Change in Total Energy in a System” c) “Mechanical Energy” d) none of the above 16. The ratio of “Desired Output” to “Required Input” is “Performance” or ___efficiency___. 17. T F Two solids of the same composition can be different phases if the internal structures differ. 18. The state principle leads to the conclusion that 19. The mass fraction vapor in a mixture of liquid and vapor is termed ___quality____.
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