Basic Qualification · B-004 Circuit components · B-004-005-009
Quel terme décrit un tube à vide avec une cathode, une seule grille et une plaque?
- ADiode
- BTétrode
- CPentode
- DTriode
Correct answer: D — Triode. Question tirée de la banque officielle d'ISDE.
Why
A vacuum tube with a cathode, one grid, and a plate is called a Triode because the prefix "tri" means three, matching the three active elements inside the tube. The full explanation — and one for every question — is in Pro.
Practise this section
Circuit components is section B-004 of the Basic exam: The parts inside the box: resistors, capacitors, inductors, diodes, transistors, tubes and what each does in a circuit.
Drill B-004 — free, no account