Q - The quality factor defines the sharpness of resonance.

QA - Quality assurance

QAM - Quadrature Amplitude Modulation

QC - Quality control

Quadrature Amplitude Modulation - A modulation method in which two signals are used to amplitude-modulate two carriers
that are in quadrature

Quantum Mechanics - The laws of physics that apply on very small scales.

Quarter Wave Tube - A resonator used most commonly on automotive air intake systems to reduce resonance.

Quasi Static - Refers to forces or displacements which vary slowly with time.

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 - Rapid cooling

Quiescent - For an electronic circuit, a quiet state in which the circuit is driving no load and its inputs are not cycling
Engineering Glossary, Engineering Dictionary Q
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