Question

A BJT is said to be operating in the saturation region if 

(a) Both junctions are reverse biased 

(b) Base – emitter junction is reverse biased and base collector junction is forward biased 

(c) Base – emitter junction is forward biased and base – collector junction reverse biased 

(d) Both the junctions are forward biased

Answer 1

Correct option (d)

Explanation: 

A BJT has four modes for operation depending on polarities of emitter base junction and collector base junction

	B – E Junction	B – C junction
Active mode	F. B.	R. B.
Saturation	F. B.	F. B.
Cut – off	F. B.	R. B.
Inverted	F. B.	R. B.

Thus for saturation both junctions are forward biased.