BJT Amplifiers and Oscillators MCQs

Decibel is defined in terms of

Decibel gain of an amplifier with Ro and 121 as output and input resistances, Vo and Vi as output and input voltages is given by

Mark the correct expression

An amplifier's power level is changed from 8 watts to 16 watts, equivalent dB gain

Is it necessary that equivalent dB gain shall remain unaltered if the power level is increased or decreased by the same factor, i.e. an increase in dB gain when power level changes from 4 to 8 watts is the same as the increase in dB gain when it would change from 8 to 16 or 16 to 32 watts

Response curve of an amplifier is a graph showing

The bandwidth of an audio amplifier extends from

Power gain of an amplifier can never be calculated if only Vo and Vi are known. Comment !

An amplifier has a power gain of 3 dB. This signifies that