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From the given circuit, using silicon BJT, what is the value of the saturation collector current?

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From the given circuit, using silicon BJT, what is the value of the saturation collector current?

(a) 5 mA

(b) 5.36 mA

(c) 5.45 mA

(d) 10.9 mA

I got this question in an international level competition.

Origin of the question is BJT DC biasing topic in chapter BJT Biasing of Analog Circuits

1 Answer

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Correct answer is (b) 5.36 mA

To explain: To obtain an approximate answer, under saturation the BJT is ON and hence acts as a short circuit. However, ideally a drop exists for the transistor which is a fixed value. For an exact answer, if the BJT is a Silicon transistor, then drop VCE = 0.2V and current is 12-0.2/2.2=5.36 mA.

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