Question

The input resistance is given by _________

(a) ∆VCE/∆IB

(b) ∆VBE/∆IB

(c) ∆VBE/∆IC

(d) ∆VBE/∆IE

I got this question during an online interview.

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

Answer 1

Correct answer is (b) ∆VBE/∆IB

The explanation is: The ratio of change in base emitter voltage (∆VBE) to resulting change in base current (∆IB) at constant collector emitter voltage (VCE) is defined as input resistance. This is denoted by ri.