When the base current of a common-emitter transistor is kept at zero, it operates in the
A
active-on region
B
breakdown region
C
saturation region
D
cut-off region.
Verified Correct Answer: D.
Physical Principles & Numerical Solution
When the base current of a common-emitter transistor is zero, it operates in the cut-off region, meaning it does not conduct current. This region is essential for the transistor to act as an off switch in circuits.
Source: Myschool Past Questions Archive (Record #72266)