Question

The output resistance of CB transistor is given by _________

(a) ∆VCB/∆IC

(b) ∆VBE/∆IB

(c) ∆VBE/∆IC

(d) ∆VEB/∆IE

This question was addressed to me in an interview.

I would like to ask this question from The CB Characteristics topic in chapter Transistor Characteristics of Electronic Devices & Circuits

Answer 1

The correct choice is (a) ∆VCB/∆IC

Easiest explanation: The ratio of change in collector base voltage (∆VCB) to resulting change in collector current (∆IC) at constant emitter current (IE)¬ is defined as output resistance. This is denoted by ro.