General exam question G6A10
Subelement G6, CIRCUIT COMPONENTS· Group G6A
Which element of a vacuum tube regulates the flow of electrons between cathode and plate?
- A.Control grid (correct answer)
- B.Suppressor grid
- C.Screen grid
- D.Trigger electrode
WhyThe control grid regulates the flow of electrons between cathode and plate in a vacuum tube. In a vacuum tube, the control grid sits between cathode and plate and its voltage directly governs how many electrons make it across that gap, giving it primary control over electron flow, answer A. The suppressor and screen grids serve other, secondary purposes in multi-grid tubes, and a trigger electrode is a feature of gas-discharge devices like thyratrons, not the element that regulates ordinary electron flow.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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