Question

The relation between $\alpha and\beta$ parameters of a transistor is given by

• A. $\alpha =\frac{1+\beta }{\beta }$
• B. $\alpha =\frac{1-\beta }{\beta }$
• C. $\alpha =\frac{\beta }{1+\beta }$
• D. $\alpha =\frac{\beta }{1-\beta }$

Answer 1

Answer: (C)

$\alpha$ and $\beta$ both are amplification factors
$I_E=I_C+I_B$
$\frac{I_E}{I_C}=1+\frac{I_B}{I_C}$
$\frac{1}{\alpha }=1+\frac{1}{\beta }$
$\alpha =\frac{\beta }{1+\beta }$