Discussion
| List - I | List - II |
|---|---|
| a. relaxation oscillator | i. PWM |
| b. S.M.P.S. | ii. triac |
| c. population inversion | iii. UJT |
| d. bi-directional control | iv. Laser |
Codes : a b c d
Answer: A
The matching is: a relaxation oscillator with UJT (iii), b S.M.P.S. with PWM (i), c population inversion with laser (iv), d bi-directional control with triac (ii), the code iii i iv ii (option A).
A UJT is the classic relaxation oscillator device, a switched-mode power supply regulates by pulse-width modulation, population inversion is the condition for laser action, and a triac conducts in both directions. Options B, C and D pair the triac or the laser with the wrong item.
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