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QDC: quick die change.
| quad fork: A steering device which attaches to
the rim of the steering wheel to assist disabled drivers in handling the
steering. |
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quadrant: The gearshift
selector indicator marked PRNDL.
quadricycle: An early type of
lightweight, four-wheeled automobile using bicycle wheels and a frame of steel
tubes.
quality: conformance to requirements
in relation to a degree of excellence.
quality grading:
Department of Transportation requirements for labelling of various tire safety
and performance criteria by the manufacturer.
quartz halogen bulb:
See quartz-halogen
bulb.
quartz-halogen bulb:
A bulb
with an inner quartz bulb
which holds a tungsten filament.
Usually the inner bulb
contains an inert gas such as iodine or one of the other five halogen gases. The
use of a halogen gas prevents the bulb
from turning black and thus reducing the amount of light output. Because this
type of bulb
requires intense heat, a quartz inner bulb
is needed instead of glass. As a result, the quartz-halogen bulb
produces more light per watt of electrical power. When replacing a
quartz-halogen bulb,
it is important not to touch the outer bulb
with your fingers. The moisture and oils deposited on the glass will cause the
glass to break under the high temperature.
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.
quenching: Dipping a heated object
into water, oil or other substance, to quickly reduce the temperature.
quick release: See quick-release.
quick-release: A cam-lever
mechanism used to rapidly tighten or loosen a wheel on a bike frame,
a seatpost
in a seat
tube, or a brake cable within cable housing.
quick release skewer:
See quick-release
skewer.
quick-release
skewer: A thin rod that runs through the center of a wheel axle; a cam-lever
is attached to one end and the other end is threaded to receive a nut. See skewer.
quicksilver: The metal
mercury. Often used in thermometers.
quill: Similar to the rattrap
type of bicycle
pedal except that the two sides of the pedal frame
are joined by a piece of metal that loops around the dust
cap.
quill bearing: See needle
bearing.
quill pedal: Similar to the rattrap
type of bicycle
pedal except that the two sides of the pedal frame
are joined by a piece of metal that loops around the dust
cap.
quill-type bearing:
See needle
bearing.
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