# Amplifiers

### Explanation of question 18

The first and second stages of an amplifier have gains of 20dB and 15dB respectively. The total gain will be

1. 0.75dB
2. 1.30dB
3. 35dB
4. 300dB

The answer is :- 3 When expressed in dB, the total gain of an amplifier is the sum of the individual gains (in dB) of each stage, i.e. 20 + 15 = 35dB.

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