DICTIONARY OF AUTOMOTIVE TERMS - "Qa"

Q:

1. The letter on the sidewall of a tire denoting the maximum speed for which it is designed (160 kph or 100mph). See speed rating.
2. A symbol for "throughput."
3. A symbol for the quantity of water discharged, usually in m³s^-1.
4. A symbol of merit, often called the Q-factor, for an energy-storing device, resonant system, or tuned circuit.
5. A symbol for "charge."

QAM:

Acronym for "quadrature amplitude modulation"

Q-band:

The frequency band mostly in radar, 36-46 GHz which has now been superseded by Ka-band.

QCD:

Acronym for "quantum chromodynamics"

Q-code:

A telecommunications code using three letter groups: QAA-QNZ for aeronautics; QOA-QQZ for Maritime uses; QRA-QUZ for all other services.

QDC:

Acronym for "quick die change."

QED:

Acronym for "quantum electrodynamics"

Q-factor:

A symbol of merit, often abbreviated "Q", for an energy-storing device, resonant system, or tuned circuit.

Q-feel:

A term given to a device which applies an artificial force on the control column of a power-controlled aircraft proportional to the aerodynamic loads on the control surfaces, thereby simulating the natural "feel" of the aircraft throughout its speed range.

Q-gas:

One based on helium (98.2% He, 1.8% butane) widely used in gas-flow counting.

Qiana:

A trade name for a special nylon with silken properties when spun into fiber.

QIC:

Acronym for "quarter-inch cartridge"

Q-meter:

A laboratory instrument which measures the Q-factor of a component

QPP amplifier:

Abbreviation for "quiescent push-pull amplifier"

QPSK:

Acronym for "quaternary phase-shift keying"

QS:

An acronym for "quick sweep" or "quantity surveyor"

Q-shell:

The electron shell in an atom corresponding to a principal quantum number of seven. It is the outermost shell for heavy radioactive elements.

Q-signal:

1. The signal, in the NTSC color system, that corresponds to the narrow-band axis of the chrominance signal.
2. The first of three-letter code kfor standard messages in international telegraphy. See Q-code

Q-switching:

A means of producing high instantaneous power from a laser.

QTS:

Acronym for quartz tuning system

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