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    Question

    Which of the following is not a part of a CRT?

    A Phosphor screen Correct Answer Incorrect Answer
    B Shadow mask Correct Answer Incorrect Answer
    C Electron gun Correct Answer Incorrect Answer
    D Gas plasma Correct Answer Incorrect Answer

    Solution

    The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons or electron emitter) and a fluorescent screen used to view images. Colour tubes use three different phosphors which emit red, green, and blue light respectively. They are packed together in stripes (as in aperture grille designs) or clusters called "triads" (as in shadow mask CRTs).

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