Q: A unit of heat energy, equal to 1018 British thermal units, or approximately 1.055 × 1021 joules.
Q meter: A direct-reading instrument which measures the Q of an electric circuit at radio frequencies by determining the ratio of inductance to resistance, and which has also been developed to measure many other quantities. Also known as quality-factor mete
Q unit: A unit of energy, used in measuring the heat energy of fuel reserves, equal to 1018 British thermal units, or approximately 1.055 × 1021 joules.
quarter-turn drive: A belt drive connecting pulleys utine calibration of recording equipment.
quartz pressure gage: A pressure gage that uses a highly stable quartz crystal resonator whose frequency changes directly with applied pressure.
quartz resonator force transducer: A type of accelerometer which measures the change in the resonant frequency of a small quartz plate with a longitudinal slot, forming a double-ended tuning fork, when a longitudinal force associated with acceleration is applied to the plate.
quartz thermometer: A thermometer based on the sensitivity of the resonant frequency of a quartz crystal to changes in temperature.
quartz-fiber dosimeter: A dosimeter in which radiation dose is determined from the deflection of a quartz fiber that is initially charged, repelling it from its metal support, and has its charge reduced by ionizing radiation, causing a proportional reduction in its deflection.
quartz-fiber manometer: NULL
quasi-linear feedback control system: Feedback control system in which the relationships between the pertinent measures of the system input and output signals are substantially linear despite the existence of nonlinear elements.
quasi-linear system: A control system in which the relationships between the input and output signals are substantially linear despite the existence of nonlinear elements.
quasi-particle detector: A detector of electromagnetic radiation at wavelengths close to 1 millimeter, based on the tunneling of single electrons (more precisely, quasi-particles) through a tunnel junction consisting of an oxide barrier between two superconductors, with a respons