湖北汽车工业学院《汽车构造》A卷.doc

湖北汽车工业学院考试（查）试卷(A) 课程名称：《汽车构造》 考试形式： 考试日期： 题号 一 二 三 四 五 六 七 八 九 十 总分 得分 评阅人 一、填空（20分，每空1分） 1、The operation sequence of a four stroke cycle engine is intake stroke、compress stroke、 power stroke、exhaust stroke 。 2、The evaluation criterions of engine’s dynamic performance are power、torque、speed。 3、Injection advance (θ) relate to engine’s speed and load. When its speed increase, θ should be increase ；When its load increase, θ should be increase。 4、Mechanical diesel fuel system consists of fuel tank fuel filter 、fuel water separator lift pump 、injection pump、injector 、governor、and high pressure and low pressure pipes. 5、Electronic Fuel Injection system（EFI）consists of three sub-systems. They are Air inlet system 、Fuel supply system 、ECU。 6 、Distributor less Ignition System(DIS) consists of power supply、ignition key、engine control module (ECM)、ignition control module (ICM)、coil、sensor、high tension lead and ignition plug。 7、There are two types of universal joints—cross type joint and constant velocity universal joint. 8、The dry clutch mechanism includes three basic parts:，driving member, driven member and operating members. 9、Positive caster means a line drawn through the steering axis centerline will meet the road surface ahead of the centerline of the wheel. 10、There are two basic types of tires-those with inner tubes and those without. Most modern automobile tires are of the tubeless type. Truck and bus tires are usually of the tube type. 11、The steering linkage connects the steering gear to the parts at the wheels. 12、A braking system consists of an energy-supplying device, a control device, a transmission device and the brake. 二、简答题（共30分，每小题5分） 1、扭曲环装入汽缸中为什么会产生扭曲？装配时应注意什么？ 扭曲环装入汽缸后，由于环的弹性内力不对称作用产生明显的断面倾斜，正扭曲环外侧拉伸应力的合力与内侧压缩应力的合力产生力臂和扭曲力矩，使环的断面扭转成盘状（反扭曲环的断面扭转成盖状）。安装正、反扭曲环时，必须注意环的断面形状和方向，不能装反。 2、可燃混合气的浓度的表示方法有哪两种？每一种的含义是什么？ 可燃混合气的浓度的表示方法有空燃比和过量空气系数两种。空燃比：将实际吸入发动机中空气的质量与燃料的质量比值称为空燃比，用符号R表示。过量空气系数：将燃烧lkg燃料实际供给的空气质量与理论上l