Multiple choice technology embedded technologies What isthe full form of QEI Quadrature Encoder Interchange Quadrature Encoder Interface Quarter Encoder Interface Quarter Encoder Interchange Reveal answer Fill a bubble to check yourself B Correct answer Explanation QEI stands for Quadrature Encoder Interface. It is a hardware module found in many microcontrollers used to decode the signals from rotary encoders to determine position, velocity, and direction of a motor shaft.