Question

For a transistor, the current ratio $'\beta'_{dc}$ is defined as the ratio of

• A. collector current to emitter current
• B. collector current to base current
• C. base current to collector current
• D. emitter current to collector current

Answer 1

Answer: (B)

collector current to base current

Answer 2

The current amplification factor of a transistor for direct current (DC) is the ratio of collector current $\left(I_{C}\right)$ to the base current $\left(I_{B}\right)$ in common emitter configuration i.e.,
$B_{D C}=\frac{I_{C}}{I_{B}}$
However, the ratio of collector current to the emitter current gives the value of current amplification factor in common base configuration, i.e.,
$\alpha_{ DC }=\frac{I_{C}}{I_{E}}$