Question

One way in which the operation of an $\text{n-p-n}$ transistor differ from that of a $\text{p-n-p}$ transistor is that

• A. the emitter junction is reverse biased in $\text{n-p-n}$.
• B. the emitter junction injects minority carriers into the base region of $\text{p-n-p}$.
• C. the emitter injects holes into the base of the $\text{p-n-p}$ and electrons into the base region of $\text{n-p-n}$.
• D. the emitter injects holes into the base of $\text{n-p-n}$.

Answer 1

The correct option is C the emitter injects holes into the base of the $\text{p-n-p}$ and electrons into the base region of $\text{n-p-n}$.

In $\text{p-n-p}$ transistors holes are majority charge carriers in emitter hence, the emitter injects holes into the base and in $\text{n-p-n}$ transistors electrons are majority charge carriers in emitter hence, the emitter injects electrons into the base region.

Hence, $\left(C\right)$ is the correct answer.