question_answer

For transistor action, which of the following statements is correct?                                          [NEET 2020]

A)  Base, emitter and collector regions should have same size.

B)  Both emitter junction as well as the collector junction are forward biased.

C)  The base region must be very thin and lightly doped.

D)  Base, emitter and collector regions should have same doping concentrations.

Correct Answer: C

Solution :

[c]

For Bi-polar junction transistor

Length Profile is \[{{L}_{C}}>{{L}_{E}}>{{L}_{B}}\]

and doping profile is \[E>C>B\]

For transistor action Base-emitter junction is forward biased and Base-collector junction is reversed biased.