時(shí)間：2011-03-11 23:18來源：藍(lán)天飛行翻譯 作者：航空 點(diǎn)擊：次
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triode electron tube. An electron tube with three active electrodes: the cathode, the control grid, and the anode, or plate. Triode electron tubes are used as amplifiers. A small change in voltage between the cathode and the control grid controls a large flow of electrons between the cathode and the anode. Triode electron tubes have, to a large extent, been replaced by the much smaller and more efficient bipolar transistors. trip-free circuit breaker (electrical component). A circuit breaker that opens a circuit any time an excessive amount of current flows, regardless of the position of the circuit breaker’s operating handle. A trip-free circuit breaker cannot be closed into an active electrical fault. triphibian (aircraft type). An aircraft with a landing gear that allows it to operate from dry ground, snow or ice, or water. triplane (type of airplane). An airplane with three main supporting wings. Triplanes were used during World War I because they were strong and lightweight, and their short wing span made them highly maneuverable. The additional expense and the drag produced by the third wing caused them to lose in popularity to the biplane and later to the monoplane. triple-slotted flap (airplane secondary control). A type of trailing-edge wing flap used on some of the larger, high-performance airplanes. Triple-slotted flaps extend from the trailing edge of a wing in three sections. The trailing edge of one section forms a duct with the leading edge of the section behind it to force air down over the top of the flap. Triple-slotted flaps prevent the airflow from separating from the surface of the flap when they are fully extended. triple-spool engine (gas turbine engine). A type of turbofan engine in which the fan is the first stage of compression, or N1. The normal low-pressure compressor is N2, and the high-pressure compressor is N3. Each stage of compressor is driven by its own turbine, and the N3 compressor is the only one whose speed is governed by the fuel control. The N1 and N2 compressors rotate at their own best speed. |
