Dictionary of Automotive Terms Abbreviations

DICTIONARY OF AUTOMOTIVE TERMS - "Que"

Queen bolt: A long iron or steel bolt serving in place of a timber queen-post.

Queen-post: The two spaced vertical ties required for roofs of more than about 30 ft (ca 10 m) span, where the central support of the tie-beam by the king-post is insufficient.

Quench

To damp or suppress a spark.
A resistor or resistor-capacitor shunting a contact, to reduce high-frequency sparking when a current is broken in an inductive circuit
To cool suddenly and rapidly after heating.

Quench area: A zone in the Combustion chamber where the Piston at Top dead center is very close to the Cylinder head. Because the piston and cylinder head is Cooler than the unburned part of the Fuel-air mixture (i.e., End gas), they pull the heat from the end gas. Because the end gas is now cooler, Detonation is quenched or reduced. However, the process does form unburned Hydrocarbons.

Quencher: A material introduced into a luminescent substance to reduce the duration of phosphorescence.

Quench frequency: The lower frequency signal used to quench intermittently a high-frequency oscillator, e.g., in a super-regenerative receiver.

Quench Hardening: Hardening a ferrous alloy by austenitizing and then cooling rapidly enough so that some or all of the austenite transforms to martensite

Quenching

Dipping a heated object into water, oil or other substance, to quickly reduce the temperature. Quenching into water gives a more rapid cooling rate than into oil. The term also applies to cooling in salt and molten-metal baths or by means of an air blast. Applied to steels heated above their upper critical temperature in order to harden them prior to tempering and to other alloys for solution treatment prior to precipitation hardening.
A nuclear engineering term to describe the process of inhibiting continuous discharge, by choice of gas and/or external valve circuit, so that discharge can occur again on the incidence of a further photon or particle in a counting tube.
A suppression of oscillation, particularly periodically, as in a super-regenerative receiver.
Rapid cooling. When applicable, the following more specific terms should be used: direct quenching, fog quenching, hot quenching, interrupted quenching, selective quenching, spray quenching, and time quenching.

Quenching oscillator: One with a frequency slightly above the audible limit, and which generates the voltage necessary to quench the high-frequency oscillations in a super-regenerative receiver.

Quench oil: Oil injected into the product stream leaving a cracking or reforming heater. It lowers the temperature of the stream and thus stops (quenches) any further, undesired, chemical reaction.

Quench time: That required to quench the discharge of a Geiger tube. Dead time for internal quenching, paralysis time for electronic quenching, although dead time is often used synonymously for the other two terms.

Quench zones: Those parts within the combustion chamber of an engine where the temperature of the air-fuel mixture is lower than necessary for optimum combustion, due to contact with the relatively cold metal surface; incomplete combustion in the quench zones is one of the two major factors contributing to HC and CO concentrations in the exhaust gas

Query language: A method of retrieving information interactively from a database without having to write a complex program. Simple commands such as FIND postcode = "SO9 2QU" are used.

Queue: A list for which insertions are made at one end and deletions at the other. The arrangement is called FIFO.

Queuing

Programs waiting, in order determined by their priority, for access to the central processor in a time-sharing system.
The situation that arises in a digital network or other system when data arrives at a device faster than the device can process it, in which data is allowed to accumulate in a buffer until a reduction in data rate allows it to be dealt with.