Which option lists the magnetron construction parts?

• A. Transmitter filament
• B. Waveguide assembly
• C. Cooling fins
• D. Anode plate, circular cavity, interaction chamber, cathode

Answer: (D)

Understanding which parts form the essential internal structure of a magnetron is being tested. The magnetron’s operation relies on a heated cathode that emits electrons, an anode assembly that contains resonant cavities, and an interaction chamber where those electrons interact with the RF field to generate microwaves. The combination of the anode plate, circular cavity, interaction chamber, and cathode embodies these core internal construction parts. The other options refer to external or auxiliary elements rather than the magnetron’s core building blocks: a transmitter filament is involved in heating in some tubes but isn’t listed as the magnetron’s construction parts, a waveguide assembly is the external microwave path, and cooling fins are generic cooling features. Therefore, this set best represents the magnetron’s internal construction.