Discussion
| List - I | List - II |
|---|---|
| a. Klystron | i. Cross-field device |
| b. Reflex Klystron | ii. Bunching |
| c. Magnetron | iii. Velocity modulation |
| d. Gunn diode | iv. Negative resistance |
Codes : a b c d
Answer: A
The correct matching is a-ii, b-iii, c-i, d-iv, which is code (A).
A klystron works by bunching of the electrons (ii), a reflex klystron by velocity modulation (iii), a magnetron is a cross-field device (i) and a Gunn diode shows negative resistance (iv).
Codes (B), (C) and (D) attach these properties to the wrong devices.
In a klystron the beam is velocity modulated in the first cavity and the faster electrons catch up with the slower ones, forming bunches that give up energy in the output cavity. The magnetron has the magnetic field crossed with the electric field, hence cross-field.
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