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Neets Master Glossary - 14192_75
Neets Master Glossary - 14192_77

Neets Module 20-Master Glossary
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1-66 SEA CLUTTER—Unwanted echoes from the irregular surface of the sea that appear on a radar indicator [18]. SEARCH RADAR SYSTEM—An early-warning device that searches a fixed volume of space [18]. SECAS (SHIP EQUIPMENT CONFIGURATION ACCOUNTING SYSTEM)—The Navy system that keeps track of the configuration of equipment in the fleet [16]. SECONDARY—The output coil of a transformer [2]. SECONDARY CELL—A cell that can be recharged by a current being passed through the cell in a direction opposite to the discharge current [1]. SECONDARY EMISSION—The liberation of electrons from an element, other than the cathode, as a result of being struck by other high-velocity electrons [6]. SECONDARY LOOP—In a cooling system, the loop that transfers the heat from the heat source, such as electronic equipment, to the primary loop; usually distilled water [18]. SECOND DETECTOR (DEMODULATOR)—The part of the receiver that separates the audio or video component from the modulated intermediate frequency [18]. SECOND-SWEEP ECHOES—See AMBIGUOUS RETURNS [18]. SELECTIVITY—The ability of a receiver to select the desired signal and reject unwanted signals [9] [17]. SELENIUM—A chemical element with light-sensitive properties that makes it useful as a semiconductor material in metallic rectifiers [7]. SELF-BIAS—In a vacuum tube circuit, the voltage developed by the flow of current through a resistor in the grid or cathode leads [6]. SELF-EXCITED GENERATORS—DC generators in which the generator output is fed to the field to produce field excitation [5]. SELF-EXCITED METER—A term used to describe meters that operate from their own power sources [16]. SELF-INDUCTION—(1) The production of a counterelectromotive force in a conductor when its own magnetic field collapses or expands with a change in current in the conductor [2]. (2) The phenomenon caused by the expanding and collapsing fields of an electron that encircle other electrons and retard the movement of the encircled electrons [10]. SELF-LUMINOUS BODIES—Objects that produce their own light [10]. SELF-SYNCHRONIZED RADAR—A type of radar in which the timing pulses are generated within the transmitter [18]. SENDING END—See INPUT END [10].






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