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Which of the following statements is true about proper functioning of a BJT?

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Which of the following statements is true about proper functioning of a BJT?

(a) One junction is forward biased and one is reverse biased

(b) Both junctions are forward biased

(c) Both junctions are reverse biased

(d) Can’t be determined

The question was posed to me during an interview.

My question is based upon BJT Construction and Operation topic in section BJT Biasing of Analog Circuits

1 Answer

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The correct option is (a) One junction is forward biased and one is reverse biased

Easiest explanation: In a BJT, depending upon the biasing of the two junctions, the BJT behaves differently. The BJT may be in saturation, wherein it acts like a short circuit, or it may be in cut-off, i.e an open circuit. The BJT can be either in forward active or reverse active mode. Active mode is the common mode, used in BJTs and obtained by one forward biased and one reverse biased junction.

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