Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Semiconductors and Electronic Devices

Question:

In a common emitter amplifier, the resistance of the output circuit is 500 times the resistance of the input circuit. If $α$ = 0.98 , then find the voltage gain and the power gain:

Options:

23500, 1300500

24500, 1200500

22505, 1300500

23500, 1200500

Correct Answer:

24500, 1200500

Explanation:

Given $α = 0.98$ and $\frac{R_{out}}{R_{in}}=500$

$β=\frac{α}{1-α}=\frac{0.98}{1-0.98}=49$

Voltage gain = $(β)(\frac{R_{out}}{R_{in}})=(49)(500)=24500$

Power gain = $(β^2)(\frac{R_{out}}{R_{in}})=(49)^2(500)=1200500$