Question

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

• A. in region (III)
• B. both in region (I) and (III)
• C. in region (II)
• D. in region (I)

Hint:

In a transistor switch, the transistor is operated in the saturation region (region III) to turn it on or in the cutoff region to turn it off.

Answer 1

The Correct Option is A

Step 1: Understand the transistor switch behavior.
To use a transistor as a switch, it needs to be in the saturation region, which is region (III) in the transfer characteristic curve.
Step 2: Conclusion.
Thus, the transistor is used in region (III) for switching applications.
Final Answer: \[ \boxed{\text{in region (III)}} \]