A transistor having =0.99 is used in a common base amplifier. If … - Vidyadip

MCQ

A transistor having $\alpha=0.99$ is used in a common base amplifier. If the load resistance is $4.5 \,k \Omega$ and the dynamic resistance of the emitter junction is $50 \,\Omega$ the voltage gain of the amplifier will be

A
$79.1$
✓
$89.1$
C
$78.2$
D
$450$

✓

Answer

Correct option: B.

$89.1$

b
(b)

$\alpha=0.99 \quad R_L=4.5 \,k \Omega \quad R_I=50 \,\Omega$

$A_v=\alpha \cdot \frac{R_L}{R_I}=0.99 \times \frac{4.5}{50} \times 10^3$

$\therefore A_v=0.0891 \times 10^3=89.1$

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