时间:2011-03-11 23:18来源:蓝天飞行翻译 作者:航空 点击:次
trammel bar. A wood or metal bar on which trammel points are mounted to compare distances. trammel points (aircraft maintenance tool). A set of sharp-pointed pins that protrude from the side of a long wood or metal bar (a trammel bar). A trammel bar is used to tram, or square up, the Pratt truss used in an airplane wing. See tram. transceiver (communications equipment). A piece of radio communications equipment in which all of the circuits for the receiver and the transmitter are contained in the same housing. transducer. A device that changes energy from one form into another. A microphone is an example of a transducer. It changes variations in air pressure into variations in electrical voltage. A radio speaker is another type of transducer. A speaker changes variations in electrical voltage into variations in air pressure, or sound. transfer punch (sheet metal tool). A special type of punch used to mark the center of a rivet hole when the punch is stuck through an existing rivet hole. The diameter of the shank of the punch near the tip is the same as that of the rivet hole, and the end of the punch is flat; but there is a short, sharp point protruding from its center. This point makes a small impression in the metal that is used to start a drill at the location the rivet hole is to be drilled. transformer (electrical component). An electrical component used to change the voltage and current in an alternating current circuit. The core of a transformer is made of a stack of soft iron laminations, and the windings, which consist of several coils of insulated wire, are wound around the core. The winding connected to the power source is called the primary winding, and the windings connected to the electrical loads are called secondary windings.
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