Question

A transistor is used in the common emitter mode as an amplifier. Then

• A. the base-emitter junction is forward-biased.
• B. the base-emitter junction is reverse-biased.
• C. the input signal is connected in series with the voltage applied to bias the base-emitter junction.
• D. the input signal is connected in series with the voltage applied to bias the base-collector junction In p-type semiconductor $n_h>n_e$.

Answer 1

Answer: (A), (C)

the base-emitter junction is forward-biased.
the input signal is connected in series with the voltage applied to bias the base-emitter junction.

When a transistor is used in the common emitter mode as an amplifier, the base-emitter junction acts as input junction and collector-emitter junction acts as output junction. The input junction is made forward biased by applying forward voltage and output junction is made reverse biased by applying reverse voltage. The input signal is connected in series with the voltage applied to forward bias the base-emitter junction.