Question

In a common emitter transistor amplifier the audio signal voltage across the collector is $3\,V$. The resistance of collector is $3\, k\Omega$. If current gain is $100$ and the base resistance is $2\, k\Omega$, the voltage and power gain of the amplifier is :

• A. 15 and 200
• B. 150 and 15000
• C. 20 and 2000
• D. 200 and 1000

Answer 1

Answer: (B)

150 and 15000

Answer 2

The correct option is(B): 150 and 15000.

Current gain $(\beta)=100$

Voltage gain $(A _{ V }) =\beta \frac{R_{c}}{R_{b}}$

$=100\left(\frac{3}{2}\right)$

$=150$

Power gain $= A_{v} \beta$

$= 150(100)$

$= 15000$