Question

The time taken for a transistor to turn from saturation to cut off is _________

(a) inversely proportional to charge carriers

(b) directly proportional to charge carriers

(c) charging time of the capacitor

(d) discharging time of the capacitor

I had been asked this question in an internship interview.

The above asked question is from Transistor Switching Times topic in division Transistor Characteristics of Electronic Devices & Circuits

Answer 1

Right option is (b) directly proportional to charge carriers

Easy explanation: When sufficient charge carriers exist, the transistor goes into saturation. When the switch is turned off, in order to go into cut off, the charge carriers in the base region need to leave. The longer it takes to leave, the longer it takes for a transistor to turn from saturation to cut off.