時間：2011-03-11 23:11來源：藍(lán)天飛行翻譯 作者：admin 點(diǎn)擊：次
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coaxial cable (electrical cable). A type of two-conductor electrical cable in which a center conductor is held rigidly in the center of a braided shield which serves as the outer conductor. The term coaxial cable comes from the fact that the two conductors are coaxial — they have the same center. Coaxial cable, or coax, as it is normally called, is used for attaching radio receivers and transmitters to their antenna. coaxial propellers. Propellers of a multiengine airplane mounted on concentric propeller shafts. The engines are mounted side-by-side and drive the propeller shafts through gears. Coaxial propellers, turning in opposite directions, allow the torque produced by one propeller to counteract the torque caused by the other. coaxial rotors (helicopter rotors). A rotor system in which two rotors are mounted on the helicopter, on concentric shafts, in such a way that they turn in opposite directions — their torques cancel. coaxial shafts. Two or more shafts that have the same axis — they are concentric with each other. The hands of an analog watch are mounted on coaxial shafts. cobalt. A hard, brittle, metallic chemical element. Cobalt’s symbol is Co, its atomic number is 27, and its atomic weight is 58.93. Cobalt is used as an alloying element in permanent magnets. cobalt chloride. A dye used with silica-gel in a dehydrator to indicate the presence of moisture. When cobalt chloride is dry, it is deep blue in color, but when it absorbs water, it turns pink. If a dehydrator element is blue, the component it protects is dry. But if moisture gets into it, the silica-gel absorbs some of the moisture, and the cobalt chloride turns pink. COBOL (computer language). A high-level computer language whose command signals are similar to English commands. The acronym COBOL is taken from COmmon Business Oriented Language. cock. The British term for a valve used to stop or control the flow of fluid in a fluid line. cockpit. The portion of an aircraft or a spacecraft from which the flight crew controls the vehicle. code markings (aircraft plumbing). Markings on fluid lines made with colored tape on which words and geometric symbols are used to identify the type of fluid carried in the lines. codes, transponder. The number assigned to a particular multiple-pulse reply signal transmitted by a radar beacon transponder. coefficient. A dimensionless number used as a measure of some property or characteristic. For example, a coefficient of friction is a number used to indicate the relative amount of friction between different materials. coefficient of coupling (transformer characteristic). A measure of the amount of coupling that exists between the two windings of a transformer. If all the expanding and contracting lines of magnetic flux from one winding cut across all the turns of the other winding, the coefficient of coupling is unity, 1.0, or 100%. coefficient of drag (aerodynamic parameter). A dimensionless number used in the formula for finding the induced drag of an airfoil as it relates to the angle of attack. |
