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Question

Consider the circuit shown in the figure below:



Transistor has β=50,VBE=0.7V,VCEsat=0.2V. The maximum value of RB upto which BJT remains in saturaion is _______kΩ.
  1. 72.88

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Solution

The correct option is A 72.88
From the circuit diagram, VCCVCEsatRC=ICsat
ICsat=120.24=2.95mA
IBmin=ICsatβ=2.9550=0.059mA
For BJT, to operate in saturation region;
IBIBmin
50.7RB0.059mA
RB72.88kΩ
RBmax=72.88kΩ


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