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 transistor as a switch, it is used
\includegraphics[width=0.5\linewidth]39.png

• 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 cutoff region and saturation region are used for switching operations.

Answer 1

The Correct Option is B

Step 1: Understand the working of a transistor as a switch.
In the active region (III) of the transistor, it behaves like a switch, and in the cutoff region (I), it is off.
Step 2: Conclusion.
For a transistor to act as a switch, it needs to operate in both the cutoff (I) and saturation (III) regions. Final Answer: \[ \boxed{\text{both in region (I) and (III)}} \]