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
sleeve bearing.

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
combustion engine.

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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