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Matching Questions - Engineering

Q1:

Match the following:
  List I (Circuit)   List II (Characteristics)
A. Darlington pair 1. uses pnp and npn transistors used as power amplifier
B. CB amplifier 2. Voltage gain nearly 1 and high input impedance
C. Cascade amplifier 3. low input impedance used for high frequency isolation

A A-1, B-2, C-3

B A-2, B-3, C-1

C A-2, B-1, C-3

D A-3, B-1, C-2

ANS:B - A-2, B-3, C-1

The Common base has highest input impedance. Hence max. Part of I/p goes it. Because of resistance divider circuit. Formed between I/p impedance and series resistance. Hence can be used for isolation. It's current gain is 1. But voltage gain can be any value.

Hence b-- (3).