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For transistor action: (1) Base, emitter and collector regions should have similar size and doping concentrations. (2) The base region must be very thin and lightly doped. (3) The emitter-base junction is forward biased and base-collector junction is reverse biased.

1. 1
2. 2
3. 3
4. All of the above

Correct answer: All of the above

Solution

For proper transistor action, the base region must be thin and lightly doped to allow efficient transfer of charge carriers, and the emitter-base junction must be forward biased while the base-collector junction is reverse biased. The first statement is incorrect because the regions should not have similar size and doping concentrations.

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