Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 70

72. For transistor action :

[2010]

(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 based.

(4) Both the emitter-base junction as well as the base-collector junction are forward biased.

(a) (3), (4)

(b) (4),(1)

(c) (1),(2)

(d) (2), (3)

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Answer:

Correct Answer: 72. (d)

Solution:

  1. (d) For transistor action, the base region must be very thin and lightly doped. Also, the emitter-base junction is forward biased and base-collector junction is reverse biased.