机械英语考研真题答案如下：
1. The machine tool is an essential tool for manufacturing processes.
答案：机床是制造过程中的基本工具。
2. The cutting speed of a lathe is inversely proportional to the feed rate.
答案：车床的切削速度与进给率成反比。
3. A gear train consists of two or more gears working together to transmit motion.
答案：齿轮传动由两个或更多齿轮共同工作以传递运动。
4. The function of a bearing is to reduce friction between moving parts.
答案：轴承的功能是减少运动部件之间的摩擦。
5. The mechanical efficiency of a machine is the ratio of the useful output work to the input work.
答案：机器的机械效率是有用输出功与输入功的比率。
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