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航空术语词典 Dictionary of Aeronautical Terms 上(106)

时间:2011-03-11 23:11来源:蓝天飞行翻译 作者:admin 点击:


When the diaphragm pushes the carbon granules together (compresses them), the resistance of the carbon becomes less than when the diaphragm allows the granules to relax.
The looseness or tightness of the granules in the tube determines the resistance of the carbon, and this resistance changes in the same way the air pressure caused by the sound waves changes.
carbon monoxide (CO). A colorless, odorless gas that forms from incomplete combustion of an organic fuel. Carbon monoxide is poisonous to human and animal life.
carbon monoxide detector. A packet of chemical crystals mounted in the aircraft cockpit or cabin where they are easily visible. The crystals change their color from yellow to green when they are exposed to carbon monoxide.
carbon pile (electrical component). A type of variable resistor used in some electrical equipment.
A carbon pile is made of a stack of thin, pure carbon disks whose resistance is changed by varying the pressure on the stack.
Carbon piles are used as the control element in some types of voltage regulators. They are also used for dissipating (using up) large amounts of electrical power in certain types of electrical load banks and test equipment.
carbon pile voltage regulator. A voltage regulator used with some high-output DC generators in which a stack of pure carbon disks acts as the resistance element in the field circuit. When the generator output voltage is low, a spring compresses the carbon pile and reduces its resistance, allowing a large amount of field current to flow.
When the generator output is high, the electromagnetic field produced by a voltage-sensing coil overcomes the spring force and loosens the carbon pile, increasing its resistance and decreasing the field current.

carbon resistor (electrical component). A component used to insert a controlled amount of resistance into an electrical circuit.
Carbon resistors are made of a mixture of carbon and an insulating material formed into a small cylinder and baked. Its resistance is then measured and its value marked in the form of colored bands around one end.
carbon seal (gas turbine engine component). A rubbing seal in a gas turbine engine between a rotating shaft and a fixed housing. The seal, made of carbon, rides on a highly polished steel surface, and the close fit between the carbon and the steel keeps oil from flowing into the gas path of the engine.
carbon steel. Steel in which carbon is the chief, or principal, alloying agent. Low-carbon steel which, containing less than 0.20% carbon, is relatively soft and weak, but high-carbon steel containing up to about 0.95% carbon can be hardened until it is very strong, but also very brittle.
carbon tetrachloride. A colorless, dense, liquid halogenated hydrocarbon that has, in the past, been used as a fire extinguishing agent and as a cleaning fluid for clothing.
Carbon tetrachloride is no longer used for either of these purposes because it is harmful to the human body. When carbon tetrachloride is sprayed on a fire, it changes into the poisonous gas, phosgene.

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