Multiple choice general knowledge science & technology This is not a diode. channel tunnel schottky light emitting Reveal answer Fill a bubble to check yourself A Correct answer Explanation Channel is not a type of diode. Tunnel diode, Schottky diode, and LED (light emitting diode) are all specialized diode types. A 'channel' refers to the conducting path in a MOSFET or field-effect transistor, not a diode category.