- 行业: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
A form of electrical resistance welding used for thin sheets of metal. The metal parts are assembled and clamped between the electrodes of the spot welding machine. A timed pulse of current flows between the electrodes and melts a spot of the metal. Pressure on the electrodes forces the molten metal from the two sheets together to form a single spot which joins the sheets. Fuel tanks can be welded with a continuous, leakproof seam by allowing the spots to overlap each other.
Industry:Aviation
A form of electrical switch used to break a continuous wave of radio-frequency alternating current into a series of dots and dashes for use in continuous wave (CW) radio transmission. The key allows the operator to send the dots and dashes in the sequence needed to transmit information by Morse code.
Industry:Aviation
A form of electrical switch using mercury in a glass tube as a conductor. Two wires are brought into the glass tube in such a way that they are near each other, but do not touch. When the tube is tilted in such a way that mercury sealed in the tube covers the ends of the two wires, the switch is closed and current flows through the mercury. When the tube is tilted in the opposite direction, the mercury moves away from the wires, the switch is open, and no current flows.
Industry:Aviation
A form of electrical welding used for joining thin sheets of metal. The metal to be welded is pressed together by the electrodes of the welding machine, and low-voltage current is passed through the metal.
Heat caused by the current softens the metal, and pressure on the electrodes forces the softened metal together. The current is stopped, but the pressure is held on the electrodes until the softened metal hardens. Spot welding and seam welding are types of resistance welding.
Industry:Aviation
A form of electric-arc lamp. An arc is formed inside a transparent tube between two electrodes in an atmosphere of mercury vapor. Mercury-vapor lamps produce a bluish-green light containing a large amount of ultraviolet radiation.
Industry:Aviation
A form of electromagnetic radiation that results from nuclear fission. Gamma rays have the ability to penetrate solid material, and they are used in the radiographic method of nondestructive inspection.
Industry:Aviation
A form of electron tube having six active electrodes. The electrodes are the cathode, the anode, the control grid, and three other grids that serve special functions in controlling the passage of electrons between the cathode and the anode.
Industry:Aviation
A form of electronic check valve. A crystal diode uses a semiconductor material which allows electrons to pass in one direction, but prevents their flowing in the opposite direction.
A crystal diode is made of either silicon or germanium which has areas doped with impurities that make P-areas and N-areas.
Industry:Aviation
A form of energy that affects the speed of movement of the molecules of which a material is made. The more heat energy in a material, the faster its molecules move, and the amount of heat energy in a material determines its physical condition. Water that contains very little heat energy is a solid, ice. When heat is added to ice, the ice melts and becomes liquid water. Additional heat added to the liquid water causes it to boil, and it becomes water vapor (steam).
Our chief source of heat energy is the sun. Heat energy from the sun reaches the earth by radiation, and it is stored in plants and animals in the form of chemical energy. This chemical energy can be changed back into heat energy by the use of various types of machines.
Industry:Aviation
A form of extremely porous silica used as a desiccant. Silica gel, packaged in porous paper bags, is stored inside delicate instruments and electronic equipment that could be damaged by moisture. Moisture in the air is absorbed and held by the silica gel.
Industry:Aviation
