Sunday, 16 May 2021, 10:16 AM
Site: IMI eLearning
Course: IMI eLearning (IMI eLearning)
Glossary: Automotive Glossary


Structural lower part of a vehicle to which the running gear and body are attached. The true chassis is now evident only in larger vehicles.

Check Valve

A one way valve, using a plate or ball and spring, that permits fluid flow in one direction only. Used in hydraulic systems to retain a residual pressure.


A type of paint film defect in which cracks in the film begin at the surface and progress downward. The result is usually a straight v-shaped crack which is narrower at the bottom than the top.


A checksum is a count of the number of bits in a transmission unit that is included with the unit so that the receiver can check to see whether the same number of bits arrived. If the counts match, then one can assume that the complete transmission was received.

Chemical Bond

A reaction between atoms that causes a force such as to create a bond.

Chemical Cartridge Respirator

A respirator which uses a cartridge containing various chemical substances to purify inhaled air of certain gases and vapours.

Chemical Staining

Spotty discolouration of the topcoat sometimes caused by environmental conditions (acid rain, tree sap, etc.) It can also be caused by improper activation of body filler which leads to staining in the subsequent layers of topcoat.

Chemical Treatment

A process that uses chemical to bring about a change in something.


Description of an integrated circuit where the circuit is built on a silicon chip.


Small flakes of a finish losing adhesion from the substrate. Usually caused by the impact of stones or hard objects.