課程名稱︰汽機車引擎
課程性質︰系選修
課程教師︰蘇金佳
開課學院：工學院
開課系所︰機械系
考試日期（年月日）︰2009.4.21
考試時限（分鐘）：120分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1.(a)In an Otto cycle, the pressures at the beginning and end of the
compression process are 1 bar and 20 bar, respectively. The
pressure is then increased to 40 bar by heat addition. Assuming
that the specific heat ratio of the working fluid is 1.4 ,
calculate the compression ratio and the thermal efficiency of
the cycle. (10%)
(b)If the compression process of a Diesel cycle increases the pressure
of the working fliud from 1 bar to 40 bar, and the volume at the end
of the heat addition process is 5 times of that at the beginning of
the process, calculate the compression ratio and the thermal efficiency
of the cycle. The specific heat ratio of the working fluid is also
assumed to be 1.4. (10%)
(c)Compare and discuss the results with a T-s diagram. (10%)
2.Explain the variation of the curves shown in (a)Fig.4-11 and (b)Fig.4-14
in the text by Ferguson and Kirkpatrick. (10% @, 20%total)
(以上是open book)
(以下是close book)
3.Briefly explain the following terms: (a)bmep, (b)stoichiometric air-fuel
ratio, (c)dual cycle, and (d)residual gas fraction.(5% @, 20%total)
4.Discuss the effect of turbocharging on the performance of gasoline engines.
(10%)
5.Explain the principle of measuring the concentration of CO2 and CO in
the exhaust of gasoline engines. (10%)
6.Explain the principle of the operation of the engine dynamometer. (10%)
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