1.

From the given circuit, using a silicon BJT, what is the value of VCEQ?(a) 7 V(b) 0.7 V(c) 6.83 V(d) 7.17 VThis question was addressed to me during an online exam.Origin of the question is BJT DC biasing topic in division BJT Biasing of Analog Circuits

Answer»

The CORRECT choice is (C) 6.83 V

To explain I would say: Consider the BJT to be in SATURATION. Then IC=12-0.2/2.2k=5.36 mA

And IB=12-0.8/240k=0.047 mA

IBMIN=ICSAT/β=5.09/50=0.1072mA which is GREATER than above IB.

Hence TRANSISTOR is in the active region.

Thus IC=βIB.

VBE=0.7V

IB=12-0.7/240=47.08μA

IC=50×47.08=2.354 mA

VCE=VCC-ICRC=12-2.354*2.2=12-5.178=6.83V.



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