Question

The voltage gain of an amplifier stage is $100$ . The gain expressed in $dB$ is :

• A. $100$
• B. $40$
• C. $20$
• D. $10$

Answer 1

Answer: (B)

Voltage gain in Decibel scale $=20{\left(log\right)}_{10}\left(100\right)$ $=20{\left(log\right)}_{10}{\left(10\right)}^2=40dB$