Question

1. transistors operate in the active, or linear region when they are used

a. as switching circuits.
b. to amplify weak signals.
c. as rectifiers.
d. in the breakdown region.

Explanation:

When transistors are used to amplify weak signals, they operate in the active (linear) region. In this region, the output is proportional to the input, which is essential for amplification.

• Option A: Transistors in switching circuits operate in cutoff or saturation regions, not the active region.
• Option C: Rectifiers are typically diodes, not transistors in the context of this question.
• Option D: The breakdown region is not the normal operating region for amplification (active - linear operation).

Answer:

B. to amplify weak signals.