TS Police SI Prelims 2022 · Question 197

Question 197 of the TSLPRB SI Preliminary Written Test 2022 (7 August 2022). Try it first, then open the answer and explanation.

1. SI Prelims 2022 · Q197 · General Science · Science & Technology

   In fiber optic communication the source of Light used is

   1. Light Emitting Diode (LED)
   2. Compact Fluorescent Lamp (CFL)
   3. Diode
   4. Semi conductor laser

   దృశా తంతువు సంసర్గ లో ఏ కాంతి జనకమును ఉపయోగిస్తారు ?

   1. కాంతి ఉద్గార డయోడ్ (LED)
   2. కాంపాక్ట్ ఫ్లోరోసెంట్ లాంప్ (CFL)
   3. డయోడ్
   4. అర్ధ వాహక లేజర్
   Show answer

   Answer: (1) Light Emitting Diode (LED) / (4) Semi conductor laser

   సమాధానం: (1) కాంతి ఉద్గార డయోడ్ (LED) / (4) అర్ధ వాహక లేజర్

   Optical-fibre systems use LEDs for short, low-speed links and semiconductor laser diodes for long-distance, high-speed links, so TSLPRB's final key accepted both (1) and (4). A CFL is unsuitable because its light is not monochromatic and cannot be coupled into a fibre efficiently. (TSLPRB's final key also gave the mark to candidates who left this question unanswered.)

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