Question

In the circuit shown below,

Stability factor S is

• A. 32.258
• B. 1
• C. 33.258
• D. None of these

Answer 1

The correct option is C 33.258

Given circuit is fixed bias,
$I_C=\frac{V_{CC}-V_{CE}}{R_C}=\frac{10-4}{2\times {10}^3}=3mA$
$I_B=\frac{V_{CC}-V_{BE}}{R_B}=\frac{10-0.7}{100\times {10}^{-3}}=93\mu A$
Now, $\beta =\frac{I_C}{I_B}=\frac{3\times {10}^{-}3}{93\times {10}^{-6}}=32.258$
​​​​​​​Stability factor, $S=1+32.258=33.258$