課程名稱︰質能平衡
課程性質︰必
課程教師︰蔡偉博
開課學院：工
開課系所︰化工
考試日期（年月日）︰100/6/21
考試時限（分鐘）：120
是否需發放獎勵金：yes
（如未明確表示，則不予發放）
試題 :
Pick 5 out of 6 questions. 25 points each.
1. (a) Calculate the bubble point of a liquid mixure of 0.7 mol fr. n-hexane
and 0.3 mole fr. n-pentane at 10 atm.
(b) Calculate the dew point of a vapor mixure of 0.7 mol fr. n-hexane and
0.3 mole fr. n-pentane at 10 atm.
2. (a) Calculate delta H, delta V, delta T changes for 1lb of saturated vapor
of n-butane going from 2 atm to 20 atm (saturated)
(b) Calculate the enthalpy change for 10 lb of butane going from a volume of
2.5 ft^3 @360 F to saturated liquid at 10 atm.
3. Feedwater heaters are used to increase the efficiency of steam power plants.
A particular heater is used to preheat 10kg/s of boiler feed water from
20 degree C to 188 degree C @ 1200 kPa by mixing it with saturated steam
bled from a turbine @ 1200 kPa, 188 degree C. the heater loses heat
@ 50J/ gram exiting mixure. What fraction of the exit stream is steam?
4. Calculate the adiabatic flame tem[eratire of C3H6(g) @ 1atm when burned with
30% excess air, and tje reactamts enter @ 50 degree C.
to be continued...
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人生到處知何似? 應似飛鴻踏雪泥。泥上偶然留指爪,鴻飛那復計東西。
老僧已死成新塔, 壞壁無由見舊題。往日崎嶇君知否？路長人困蹇驢嘶。
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