MT1solution07 - ENGR 225 September 28, 2007 Name _...

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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 a) thermal b) mechanical c) phase d) all of the above e) none of the above 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 a) adiabatic b) isothermal c) quasi-equilibrium d) equilibrium e) none of the above 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 a) internal energy b) kinetic energy c) potential energy d) all of the above e) none of the above 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 a) solids cannot be superheated even though gases can be b) the set of equilibrium states for a simple compressible system forms a surface in PvT space c) quasi-equilibrium only occurs when temperature is high and pressure low 19. The mass fraction vapor in a mixture of liquid and vapor is termed ___quality____. 20.
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MT1solution07 - ENGR 225 September 28, 2007 Name _...

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