Discussion
Match the List-I with List II and select the correct answer using the codes given below :
| List I | List II |
|---|---|
| (a) Voltage gain | (i) Very high CE |
| (b) Current gain | (ii) Very low in CC |
| (c) Power gain | (iii) High in CB |
| (d) Output resistance | (iv) Low in CB |
Answer: A
The matching is a-iii, b-iv, c-i, d-ii: voltage gain high in CB, current gain low in CB, power gain very high in CE, output resistance very low in CC.
The three transistor configurations behave differently. In common base the current gain is just under 1 (low) while the voltage gain is high. In common emitter both current and voltage gain are high, so the power gain is the largest of the three. In common collector (the emitter follower) the voltage gain is slightly below 1 but the current gain is high, the input resistance is high and the output resistance is very low.
Code D is the nearest rival: it pairs voltage gain with 'very low in CC' and output resistance with 'high in CB'. The CB output resistance is indeed high, but the CC voltage gain is close to unity, not very low, so the pairing of (a) fails. Codes B and C put the current gain or the output resistance against the wrong configuration.
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