The voltage gain and current gain of a transistor amplifier in common emitter configuration are respectively…
The voltage gain and current gain of a transistor amplifier in common emitter configuration are respectively 150 and 50 . If the resistance in the base circuit is $850 \Omega$, then the resistance in the collector circuit is
$1700 \Omega$
$2250 \Omega$
$2550 \Omega$
$3000 \Omega$
Solution
For CE configuration of transistor,
$\begin{aligned}
& A_v=150, \beta=50, R_B=850 \Omega \\
& \therefore \quad \text { Voltage gain, } A_v=\beta\left(\frac{R_0}{R_I}\right)=\beta\left(\frac{R_C}{R_B}\right) \\
& \Rightarrow 150=50 \times \frac{R_c}{850} \\
& \therefore R_c=3 \times 850=2550 \Omega
\end{aligned}$