Ham Amateur Radio Technician Practice Exam

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Prepare for the Ham Amateur Radio Technician Exam. Access interactive flashcards, detailed multiple choice questions with hints and explanations to maximize your chances of success. Get confident and ready for your test today!

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What element of a vacuum tube regulates the flow of electrons between cathode and plate?

Filament
Anode
Control grid
Getter

The correct answer is: Control grid

The control grid is the element of a vacuum tube that regulates the flow of electrons between the cathode and the anode (or plate). In a vacuum tube, the cathode emits electrons when heated, and these electrons flow towards the anode due to a voltage difference. The control grid is positioned between the cathode and anode and is usually negatively charged relative to the cathode. By applying a voltage to the control grid, its negative charge can repel some of the emitted electrons, effectively controlling the number of electrons that reach the anode. This variable control allows the vacuum tube to amplify signals or switch currents, making it a fundamental component in older electronic devices and radio transmitters. The other components mentioned in the choices serve different functions: the filament is responsible for heating the cathode, the anode collects the electrons, and the getter is used to remove any residual gases within the tube to maintain a vacuum.