- Quick-break switch
- A switch having a spring or other device to produce a quick break, independently of the operator.
- Quick link
- A special bicycle chain connecting link that allows derailleur-type chains to be disassembled and reassembled without the use of tools
- Quick make-and-break switch
- An electrical switch which makes and breaks the circuit with a quick snap.
Also see
- Quick release
- A locking or securing style of axle or bolt. One style has a lever
which loosens a bolt so that another component can be removed.
Also see
- 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 hitch pin
-
A cylinder used to secure a larger item. It is inserted into a hole and is prevented from being easily pulled out because there is a spring-loaded ball at the other end.
Quick release hitch pin
Also see
- 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.
Also see
- Quick return mechanism
- A reciprocating motion, for operating the tool of a shaping machine etc, in which the return is made more rapidly than the cutting stroke, so as to reduce the idling time.
- Quicksand
- Loose sand mixed with such a high proportion of water that its bearing-pressure is very low. Also called running sand.
- Quick-setting inks
- A general term for inks formulated to set quickly, allowing handling of the stock after printing
- Quick-take-up master cylinder
- The rod that transmits the movement and force of the driver from the brake pedal lever to the master cylinder piston.
- Quick take-up valve
-
- A residual pressure valve with a relief hole in a brake master cylinder
- The part of a quick-take-up master cylinder that controls fluid flow between the reservoir and the primary low-pressure chamber.
- Quick test
- A functional diagnostic test of Ford's EEC system that displays test results as a series of service codes
- Quiescent
- A general term for a system waiting to be operated, as a valve ready to amplify or a gas-discharge tube to fire.
- Quiescent carrier transmission
- One for which the carrier is suppressed in the absence of modulation.
- Quiescent operating point
- The steady-stats operating conditions of a valve or transistor in its working circuit but in the absence of any input signal.
- Quiescent push-pull amplifier
- (QPP) Thermionic valve or transistor amplifier, in which one side alone passes current for one phase, the other side passing current for the other phase.
- Quiescent tank
- A form of sedimentation tank in which sewage is allowed to rest for a certain time without flow taking place.
- Quiet automatic volume control
- The application of this is known as quieting. Also delayed automatic gain control.
- Quieting sensitivity
- The minimum input signal required by a frequency-modulation radio receiver to give a specified signal/noise ratio at the output.
- 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.
- A form of drive used for electric locomotives in which the armature of the driving motor is mounted on a quill surrounding the driving axle, but connected to it only by a flexible connection. This enables a small amount of relative motion to take place between the motor and the driving axle.
- A hollow non-rotating shaft in which another shaft rotates under power, for providing axial movement as in a drilling machine spindle.
- 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.
- Quinaldine
- 2-methylquinaline. C10H9N. Bp 246°C. A colorless refractive liquid, which occurs to the extent of 25% in quinoline obtained from coaltar.
- Quincke's method
- A method for determining the magnetic susceptibility of a substance in solution by measuring the force acting on it in terms of the change of height of the free surface of the solution when placed in a suitable magnetic field.
- Quinhydrone
- C6H4O2 + C6H4(OH)2. An additive compound of one molecule of l.4 quinone and one molecule of l.4-dihydroxybenzene. It crystallizes in green prisms with a metallic luster.
- Quinhydrone electrode
- A system consisting of a clean, polished, gold or platinum electrode dipping into a solution containing a little quinhydrone, for determining pH-values, making use of the pH dependence of the redox properties of the system
- Quinine
- C20H24O2N2N23H2O. Mp 177°C. An alkaloid of the quinoline group, present in Cinchona bark. It is a diacid base of very bitter taste and alkaline reaction. It crystallizes in prisms or silky needles; the hydrochloride and sulfate are used as a febrifuge but have been largely superseded as a remedy for malaria, although they are still used in the treatment of leg cramps.
- Quinoline
- A heterocyclic compound consisting of a benzene ring condensed with a pyridine ring. It is a colorless, oily liquid, mp -19.5°C, bp 240°C, rel.d. 1.08, of characteristic odor, insoluble in water, soluble in most organic solvents. It is found in coaltar, in bone oil, and in the products of the destructive distillation of many alkaloids. It can be synthesized by heating a mixture of aniline, glycerine, and nitrobenzene with concentrated sulfuric acid.
- Quinones
- Compounds derived from benzene and its homologues by the replacement of two atoms of hydrogen with two atoms of oxygen, and characterized by their yellow color and by being readily reduced to dihydric phenols. According to their configuration they are divided into 1.2-quinones and 1.4-quinones.
- Quinonoid formula
- A formula based upon the diketone configuration of 1.4-quinone (benzoquinone), involving the rearrangement of the double bonds in a benzene nucleus; adopted to explain the formation of dyestuffs, e.g., colored salts of compounds of the triphenylmethane series.
- Quinoxalines
- A group of heterocyclic compounds consisting of a benzene ring condensed with a diazine ring. They can be obtained by the condensation of 1.2-diamines with 1.2-diketones.
- Quintic equation
- An algebraic equation of the fifth degree. Unlike like equations of lower degree, its general solution (and that of equations of higher degree) cannot be expressed in terms of a finite number of root extractions.
- Quintuple point
- A point on a concentration-pressure-temperature diagram at which a three-component system can exist in five phases.
- Quire spacing
- On a rotary printing press, as the product is delivered, it is separated into quires or batches by the kicker which delivers a kick copy at the required interval.
- Quirewise
- Sections which after printing are folded and insetted one in the other. This method allows the booklet to be stitched instead of stabbed.