Question

if a sinusoidal voltage is applied to the base of a biased npn transistor and the resulting sinusoidal collector voltage is dipped near zero volts, the transistor is
select one:
○ a. operating normally
○ b. being driven into cutoff
○ c. being driven into saturation
○ d. operating linearly

Explanation:

When a transistor is in saturation, the collector - emitter voltage (\(V_{CE}\)) is very low (near zero for silicon transistors). In saturation, the transistor acts like a closed switch. When a sinusoidal voltage is applied to the base of a biased npn transistor and the collector voltage is clipped near zero volts, it means that for part of the input cycle, the transistor has entered the saturation region. In the normal (active) operating region, the transistor amplifies the input signal linearly and \(V_{CE}\) is not near zero. When driven into cutoff, the collector current is very low and \(V_{CE}\) is close to the supply voltage. Operating linearly implies an undistorted output (no clipping near zero in this context).

Answer:

C. being driven into saturation