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A stack of core arrays and associated electronics, the stack containing a specific number of core arrays.

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A radar echo which is caused by the electromagnetic energy being transmitted to the target by an indirect path and returned as an echo along the same path. An indirect echo may appear on the radar display when the main lobe of the radar beam is reflected off part of the structure of the ship (the stack for example) from which it is reflected to the target. Returning to own ship by the same indirect path, the echo appears on the PPI at the bearing of the reflecting surface. Assuming that the additional distance by the indirect path is negligible, the indirect echo appears on the PPI at the same range as the direct echo received. Also called FALSE ECHO.


The negative air pressure generated by buoyancy of hot gases inside a furnace. The temperature difference between gases within the furnace and in the atmosphere along with furnace and stack height basically determine the amount of draft generated by the furnace. Draft is generally measured in negative inches of water column. ('-w.c.'; 27.7 inches w.c. = 1 psig)


The draft which would be available at the base of a stack if there were no friction or acceleration losses from the stack.


Gas and solid products discharged from the stack.


The fraction of total heat which exits with the flue gas through the stack. The quantity is customarily expressed as a percent of the total heat input. The stack loss is directly proportional to the stack exit temperature; the higher the temperature, the greater the stack loss.


A vertical conduit, which due to the difference in density between internal and external gases creates a draft at its base.


A soft synthetic rubber washer with a steel core fixed in the outer ring (in the seal groove) in contact with the inner ring to retain lubricant and keep out contamination.


In electrical equipment, a material designed to conduct magnetic flux easily but offer high resistance to current. In a nuclear reactor, the area in which nuclear fission takes place and heat is produced.


A temporary magnet made of a ferromagnetic core wound with insulated wire through which is passed an electric current. The current flow through the windings causes a magnetic field to build that will attract magnetic material.


Thin sheets of magnetic steel or iron that are used in armature and magnetic pole cores to reduce the production of eddy currents. The laminations increase the electrical resistance of the core material.
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