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In the circuit shown, the silicon BJT has β = 50. Assume V_BE = 0.7 V and V_CE(sat) = 0.2 V. Which one of the following statements is correct?

1. For R_C = 1 kΩ, the BJT operates in the saturation region
2. For R_C = 3 kΩ, the BJT operates in the saturation region
3. For R_C = 20 kΩ, the BJT operates in the cut-off region
4. For R_C = 20 kΩ, the BJT operates in the linear region

Correct answer: For R_C = 3 kΩ, the BJT operates in the saturation region

Solution

The correct option indicates that with a collector resistor of 3 kΩ, the BJT is able to provide sufficient base current to maintain saturation, allowing it to operate effectively in that region, where it can fully conduct and minimize voltage drop across the collector-emitter junction.

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