Question

For transistor action which of the following statements is correct?

• A. Base, emitter and collector regions should have similar size and doping concentration.
• B. The base region must be very thin and lightly doped.
• C. The emitter junction is forward biased and collector junction is reverse biased.
• D. Both emitter junction and collection junction are forward biased.

Answer 1

Answer: (B), (C)

The correct options are
B The base region must be very thin and lightly doped.
C The emitter junction is forward biased and collector junction is reverse biased.

The emitter junction is forward biased and collector junction is reversed biased and the base region of a transistor provides an interaction between the emitter and collector of transistor and this region is made thin to reduce the recombination of holes and electrons in this region , so that there is appreciable collector current.

Hence option B and C are correct.