Discussion
Match List – I with List – II and select the correct answer using the codes given below :
| List-I | List-II |
|---|---|
| (a) Fan regulator | (i) Two transistor model |
| (b) SCR | (ii) dc-dc conversion |
| (c) Choppers | (iii) Triac-Diac pair |
| (d) Quantum efficiency | (iv) LED |
Answer: C
The matching is a-iii, b-i, c-ii, d-iv. A fan regulator is a dimmer built round a Triac and Diac pair. An SCR is explained by the two transistor model. A chopper is a dc to dc converter. The quantum efficiency is a figure of merit of an LED, the number of photons per injected carrier. Option (A) gives the fan regulator as dc-dc conversion. Option (B) gives it as the LED. Option (D) gives the SCR as dc-dc conversion. Only (C) matches all four.
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