1. When a substance undergoes an isobaric expansion at a pressure higher than it
ID: 1767083 • Letter: 1
Question
1. When a substance undergoes an isobaric expansion at a pressure higher than its critical pressure it may undergo a phase change. a. TRUE/FALSE An isobaric process is at constant pressure, an isothermal process is at constant temperature, an adiabatic process has not change in heat, an ideal gas undergoes a polytropic process with n-1, an incompressible substance does not do work 2. a. TRUE/FALSE Within the liquid-vapor dome a state can be fixed by either specific volume or pressure or temperature. 3. a. TRUE/FALSE Liquid water, solid ice, and water vapor can coexist in a stable equilibrium occurring at exactly 273.16 K (001 32.02 °F) and a partial vapor pressure of 611.657 pascals (6.11657 mbar; 0.00603659 atm) 4, a. TRUE/FALSE States to the left of the temperature dome are called superheated vapors and states to the right are called subcooled liquid states 5. a. TRUE/FALSE A quality value of zero is at its saturated vapor state. 6. a. TRUE/FALSE Liquid states can be obtained using saturated liquid data. The compressed liquid tables (a-5) show minimal changes at the same temperature and various pressures. Thus v(T,p) -vf, u(T,p) -uf and h(T,p) hf 7. a. TRUE/FALSE 8. The unitless compressibility factor approaching one is not valid for ldeal Gases a. TRUE/FALSE A polytropic process is a quasiequilibrium state and pVn-constant, where n=0 for an isobaric process, where n-1 for an isothermal ideal gas 9. a. TRUE/FALSE 10. The specific heat ratio, k must be less than one for an ideal gas a. TRUE/FALSEExplanation / Answer
1. True. Liquid to vapor
2. False. For an isothermal process, change in internal energy is zero, so work done is equal to change in heat.
3. false. we need info about dryness fraction and pressure or temperature or specific volume.
4. True.
5. False. Its vice versa.
6. False. Its subcooled liquid.
7. True.
8. False.
9. True.
10. False. K for air is 1.4.
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