E85 - Refers to a fuel blend of 85 percent ethanol and 15 percent gasoline.
Eccentric - A circle not having a geometric centre.
Eccentricity - The variation of the outer diameter of a shaft surface when referenced to the true geometric centreline of the
Eccentricity Ratio - The vector difference between the bearing centreline and the average steady-state journal centreline.
Eddy Current - Induced circulating currents in a conducting material that are caused by a varying magnetic field.
Edge Dislocation - A linear crystalline defect associated with the lattice distortion produced in the vicinity of the end of an extra
half-plane of atoms within a crystal.
Efficiency - A measure of how well a machine changes energy into useful energy.
Effluent The fluid exiting a system, process, tank, etc.
Elastic Limit - The maximum load that a body can experience and still return to its original shape.
Elasticity - A material is elastic if it returns to it's original shape after being deformed.
Elastic Modulus (Young’s Modulus or the Modulus of Elasticity) - The ratio of stress to strain when deformation is totally elastic;
also a measure of the stiffness of a material.
Elastomer - An amorphous, cross-linked high polymer that will stretch rapidly under tension, reaching high elongations (500 to
Electric Motor Noise - There are numerous applications of electric motors and the type of noise produced by each may be very
specific to the installation and type of motor.
Electric Motors - There are a number of different types of electric motor: AC Induction Motors, Brush Direct Current Motors,
Brushless Direct Current Motors and Stepper Motors.
Electrode - The terminal at which electricity passes from one medium into another, such as in an electrical cell where the current
leaves or returns to the electrolyte.
Electroform - To form shaped objects by electro-deposition on a mould.
Electrolysis - The process of changing the chemical composition of a material by passing an electric current through it.
Electrolyte - A solution of a substance that is capable of conducting electricity
Electromagnet - An electrically excited magnet capable of exerting mechanical force or of performing mechanical work
Electron Beam Welding - A technique for joining materials in which components to be welded are heated by a concentrated
beam of high-velocity electrons in a vacuum.
Electrostatic Precipitator - A device which uses an electric field to trap particulate pollutants.
Elm - A hard, durable and coarse grained wood. Used for ship building.
Elongation - Increase in length which occurs before a metal is fractured, when subjected to stress.
Emery - A natural abrasive used for grinding or polishing.
Emery Cloth - Fabric backed abrasive paper.
Empirical Law - A law strictly based on experiment, which may lack theoretical foundation.
Encastre - A term which describes the constraints imposed on a structure where it joins its foundations.
End Float - Movement of one shaft along its centreline due to the freedom of movement permitted by a journal bearing or a
Endurance Limit - In fatigue testing, the number of cycles which may be withstood without failure at a particular level of stress.
Energy Density - Characteristic parameter of a battery/electrical power source indicating the amount of electrical energy stored
per unit weight or volume.
Engine - A machine which produces power to do work, particularly one that converts heat into mechanical work.
Engine Bay - The enclosure in which an engine is installed in a vehicle.
Engine Configurations - Various configurations of engine have been developed over the years for power, low noise and
vibration, economy or weight.
Engine Excitation Mechanisms - The physics behind the vibrations generated by the internal mechanisms of an internal
Engine Orders - Engine orders are simply the amplitudes of the frequency components which are the multiples of the rotating
Engineering Units - Units that are decided upon by an individual user or by agreement among users.
EPC - Engineering, Procurement, & Construction
Epoxy Glue - A two-part resin/hardener glue that is extremely strong.
Errors & Omissions - Discrepancies in the plans or specifications that are the engineer's fault.
Etching - Chemical surface corrosion.
Enthalpy - Thermodynamic property of a substance defined as the sum of its internal energy plus the quantity Pv/J, where P =
pressure of the substance, v = its volume, and J = the mechanical equivalent of heat.
Ethanol E85 - Refers to a fuel blend of 85 percent ethanol and 15 percent gasoline.
Ethyne - Also known as Acetylene, used for welding as the flame temperature is roughly 3300°C when burnt with oxygen.
E-Type Thermocouple - Chromel-constantan thermocouple with a temperature range of 0 to 800 °C.
Eutectic - An isothermal reversible reaction or an alloy having a structure or composition indicated by the eutectic point.
Evaporative Emissions - Hydrocarbon vapours that escape from a fuel storage tank, a vehicle fuel tank or vehicle fuel system.
Exhaust - An exhaust system of an internal combustion engine performs a number of functions.
Exhaust Noise - The exhaust system of an internal combustion engine has a number of functions, one of which is to reduce the
noise of the waste gases as they are expelled from the engine to the atmosphere.
Exhaust Silencer - Acoustic filter elements used to reduce sound pressure levels in an exhaust system.
Exhaust Tailpipe - The final pipe that the exhaust gas passes through before mixing with the atmosphere.
Explosive Decompression - A very rapid reduction of air pressure inside a cabin, coming to a new static condition of balance
with the external pressure.
External Force - A surface force or body force acting on an object.
External Thread - A screw thread which is formed on an external cylinder,e.g. bolts, screws, studs.
Extruded - A material that has been shaped by forcing through a die.
Extrusion - A forming technique whereby a material is forced, by compression, through a die orifice.
Engineering Glossary, Engineering Dictionary E
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