时间:2011-03-11 23:11来源:蓝天飞行翻译 作者:admin 点击:次
carbon tracking (magneto distributor malfunction). An ignition system malfunction caused by a fine track of carbon deposited inside the distributor of an aircraft magneto. The resistance of the air inside the distributor at high altitude is so low that it is possible for a spark to jump between the distributor terminals. As this spark moves across the surface of the distributor block, it leaves a thin track of carbon. The resistance of this carbon track is so much lower than that of the material of which the distributor block is made that high voltage leaks through it during normal engine operation. This high-voltage leakage can cause misfiring, loss of engine power, and possible engine damage. carbon-zinc cell (electrical cell). An electrochemical cell that changes chemical energy into electrical energy. The cell is made of a zinc can filled with a paste of ammonium chloride. A carbon rod is supported by the ammonium chloride in such a way that it cannot touch the zinc can. Electrical energy is produced as electrons leave the zinc can and travel through an external circuit to the carbon rod. A carbon-zinc cell has an open-circuit voltage of approximately 1.5 volts. Carborundum. The registered trade name for several types of man-made abrasives. Carborundum is similar to emery (a natural abrasive), and it is used to make grinding wheels. Fine particles of Carborundum are bonded to paper and cloth to make sheets and strips of abrasive materials. |