课程名称︰汽机车引擎 课程性质︰选修 课程教师︰苏金佳 开课学院：工学院 开课系所︰机械系 考试日期（年月日）︰2008.04.15 考试时限（分钟）：100分钟 是否需发放奖励金：是！谢谢 （如未明确表示，则不予发放） 试题 : close book 1.Briefly explain the following terms:(a) volumetric efficiency,(b)adiabatic flame temperature, (c)compression ratio, and (d)equivalence ratio (5%@, 20%total) 2.Discuss the intake process of the twp-stroke engine and explain the disavantage of the process. (10%) 3.Discuss the process of the Otto cycle.(10%) 4.Explain why for the same compression ratio the thermal efficiency of the Otto cycle is higher or lower than that of the Diesel cycle. (10%) 5.Explain the effect of finite heat release on the efficiency of a gasoline engine.(10%) 6.Discuss the difference between imep and bemp. (10%) 7.Write down the chemical equation of the complete combusion of nitromethane (CH3NO2) in air under stoichiometric conditions. (10%) 8.Explain the principle of the operation of the engine dynamometer. (10%) 9.Explain the variation of the curves shown down in the following figure.(10%) (图在课本 p.98 Figure4-14) --

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