Discussion
Match the List-I with List II and select the correct answer using the codes given below :
| List I (Configuration) | List II (Characteristics) |
|---|---|
| (a) Common emitter | (i) High input resistance |
| (b) Common collector | (ii) Low output resistance |
| (c) Common base | (iii) Moderate input resistance |
| (d) Emitter follower | (iv) Low input resistance |
Answer: C
The keyed matching is a-iii, b-ii, c-iv, d-i.
- Common emitter: moderate input resistance, about 1 kΩ (iii).
- Common collector: low output resistance (ii).
- Common base: low input resistance, a few tens of ohms (iv).
- Emitter follower: high input resistance (i).
The common collector amplifier and the emitter follower are the same circuit, which has both a high input resistance and a low output resistance; the question assigns one of these properties to each name. With that, only this code works: the others give the common emitter a high or low input resistance, or the common base a high or moderate one.
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