ASNT Radiographic Testing Practice Test 2025 – Comprehensive All-in-One Guide for Exam Success!

Question: 1 / 400

In an x-ray tube, what are the two essential components of the cathode?

The anode and filament

The filament and focusing cup

The two essential components of the cathode in an X-ray tube are indeed the filament and the focusing cup.

The filament is a wire that, when heated, emits electrons through a process called thermionic emission. This electron emission is critical because it creates the electron cloud that is necessary for the generation of X-rays when these electrons are directed towards the anode.

The focusing cup, usually made of metal, serves to focus the electrons emitted from the filament into a narrow beam directed towards the anode. This focusing enhances the efficiency and quality of the X-ray beam produced.

Together, these two components of the cathode play a fundamental role in the operation of X-ray tubes by controlling the production and direction of electrons, ultimately leading to effective X-ray generation for imaging and testing purposes.

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The x-ray tube and housing

The target and vacuum chamber

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