时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次
|
line-voltage regulator (electrical system component). A piece of electronic equipment, used to stabilize the line voltage supplied to a piece of electrical or electronic equipment. Circuits in the line-voltage regulator increase the output voltage when the load current increases to prevent the output voltage dropping. And they decrease the voltage when the load decreases, preventing the output voltage rising above the regulated value. link rod (radial reciprocating engine component). The rod in a radial engine that connects one of the piston wrist pins to a knuckle pin on the master rod. Link rods are also called articulated rods. See articulated connecting rod. linseed oil. Oil obtained from the seed of the flax plant. Linseed oil is used as a drying agent in some types of enamel, and as a rust preventive coating inside steel tubing used in welded aircraft structure. liquid. One of the three physical forms of matter: solid, liquid, and gas. A liquid takes the shape of its container, but does not expand to fill the entire container. Water and gasoline are examples of liquids. liquid air. Air that has been changed into its liquid state by lowering its temperature below the boiling points of oxygen and nitrogen (the main constituents of air). Liquid air is an extremely cold, faintly bluish, transparent liquid. For air to remain in its liquid state, it must be stored in a special insulated container. If liquified air is allowed to boil, the first gas released is nitrogen, and then, when the nitrogen has all boiled away, the oxygen turns into a gas. Both nitrogen and oxygen are produced commercially by boiling liquid air. liquid-cooled engine (reciprocating engine). A reciprocating engine that uses a liquid, such as water or ethylene glycol, to remove excess heat. Much of the heat energy in the fuel burned in an engine is wasted and must be carried away from the engine, or it will cause damage. In a liquid-cooled engine, the liquid coolant circulates around the cylinders in jackets and absorbs heat. This absorbed heat is carried outside the engine in the coolant, and as the coolant passes through a radiator (a liquid-to-air heat exchanger), the unwanted heat is given up to the outside air. liquid crystal. A type of liquid whose molecules can be arranged by electrical charges in such a way that polarized light cannot pass through a film of the liquid. Liquid crystal is used in the displays for calculators, clocks, watches, and in the new generation of aircraft instruments. liquid nitrogen. Nitrogen that has been changed into its liquid state by lowering its temperature. Nitrogen remains in its liquid state under standard atmospheric pressure when its temperature is kept at –195°C (78°K) or lower. liquid oxygen, LOX. Oxygen that has been changed into its liquid state by lowering its temperature. LOX remains a liquid if its temperature is kept at –183°C (90°K) or lower. Lissajous figures. Figures formed on the screen of a cathode-ray oscilloscope that show the relationship between the frequency of sine wave signals being applied to the horizontal and vertical inputs. If the frequency and phase of the two sine wave signals are the same, the Lissajous figure will be in the shape of a circle. |
