Basic Qualification · B-003 Station assembly, practice and safety · B-003-019-004
Parmi les matériaux suivants, lequel est le meilleur pour servir de mise à la terre?
- ADe la fibre de verre
- BUne tige d'acier recouverte de cuivre
- CDu plastique rigide
- DDu fer ou de l'acier
Correct answer: B — Une tige d'acier recouverte de cuivre. Question tirée de la banque officielle d'ISDE.
Why
Copper-clad steel is the best choice because it combines the strength of steel to be driven deep into the ground with the superior electrical conductivity of copper to safely carry lightning or fault currents away. The full explanation — and one for every question — is in Pro.
Practise this section
Station assembly, practice and safety is section B-003 of the Basic exam: Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.
Drill B-003 — free, no account