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Magnetron, Klystron, and TWT Quiz
RF Cafe Quiz #81

RF Engineering Quizzes - RF Cafe WebsiteAll RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

Quiz #81: Magnetron, Klystron, and TWT Quiz - RF CafeMicrowave tubes form the backbone of high-power RF generation and amplification, and this "Magnetron, Klystron, and TWT Quiz" tests your understanding of three fundamental devices. The magnetron, a crossed-field oscillator, dominates applications from radar transmitters to microwave ovens by using a thermionic cathode, an anode block with resonant cavities, and a powerful permanent magnet to generate oscillations directly from a DC supply. The klystron, by contrast, is a linear-beam amplifier that relies on velocity modulation: an electron beam passes through an input cavity, acquires velocity variations that cause it to bunch as it drifts, then induces currents in an output cavity to extract energy with high efficiency and narrowband precision. The traveling-wave tube takes a different approach, employing a slow-wave structure such as a helix or coupled cavities that allows continuous interaction between the electron beam and a propagating RF wave, yielding exceptionally broad bandwidth. Understanding how each device works, where each excels, and their inherent tradeoffs is essential for anyone working in microwave engineering. Whether you are a student, a ham radio operator, or a seasoned engineer, this quiz will sharpen your grasp of these classic vacuum electron devices. 


1. (TWT) What is the purpose of the attenuator placed along the slow‑wave structure in a TWT?






2. (Klystron) What is the primary function of the buncher (input) cavity in a two‑cavity klystron?






3. (Magnetron) In a magnetron, how does the electron cloud interact with the RF field to produce oscillation?






4. (TWT) In a helix‑type TWT, why is the pitch of the helix made smaller near the output end?






5. (General) Which of the following microwave tubes uses a crossed‑field interaction where the DC electric and magnetic fields are perpendicular to each other?






6. (Klystron) Which statement best describes the bandwidth of a typical multi‑cavity klystron amplifier?






7. (Magnetron) What is the typical efficiency range of a pulsed magnetron?






8. (Klystron) In a reflective klystron (used as an oscillator), what causes the electron bunches to return to the cavity at the correct phase?






9. (TWT) A TWT's main advantage over a klystron is its ability to deliver:






10. (Magnetron) Which of the following is true about a magnetron's magnetic field?






Quizzes from vintage electronics magazines (and many custom RF Cafe-generated quizzes) such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes
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About the RF Cafe™ Website ©1996-2026

Kirt Blattenberger - RF Cafe WebmasterRF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

Webmaster: Kirt Blattenberger  |     BSEE - KB3UON - AMA92498  |  USAF Radar Technician

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