What is the value of power gain in decibels if Poutput = 250W and Pinput = 100W?(a) 2.48dB(b) 3.98dB(c) 1.78dB(d) 3.54dBThe question was asked during a job interview.The above asked question is from The Decibel topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

What is the value of power gain in decibels if Poutput = 250W and Pinp

1.	What is the value of power gain in decibels if Poutput = 250W and Pinput = 100W?(a) 2.48dB(b) 3.98dB(c) 1.78dB(d) 3.54dBThe question was asked during a job interview.The above asked question is from The Decibel topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits
Answer» CORRECT choice is (B) 3.98dB The explanation: The power GAIN in TERMS of decibels is expressed as 10 × log (Poutput / Pinput) . Given, Poutput = 250W and Pinput = 100W Power gain = 10 × log (Poutput / Pinput) = 10 × log (2.5) = 10 × 0.3979 = 3.98dB.

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