Transfer characteristics [output voltage (V0) vs input voltage (Vi)]… | NEET 2012 (AIPMT, Prelims)

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Junction Transistor

Transfer characteristics [output voltage (V0) vs input voltage (Vi)] for a base biased transistor in CE configuration is as shown in the figure. For using transistor as a switch, it is used

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Answer: (b)

A switch needs only two states: OFF and ON.
Region I: $V_i$ small, transistor in cut-off, $I_C \approx 0$ , $V_0$ high (switch OFF).
Region III: $V_i$ large, transistor in saturation, $V_0$ nearly zero (switch ON).
Region II is the active region, used for amplification.
So the answer is (b) both in region (I) and (III).

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