Question

What is the equivalent hybrid parameter for the transistor hybrid parameter hfe?

(a) h11

(b) h12

(c) h21

(d) h22

I have been asked this question by my school principal while I was bunking the class.

The doubt is from Conversion Formulas for the Parameters of the Three-Transistor Configurations topic in section Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

Correct choice is (c) h21

For explanation I would say: The transistor hybrid parameter hfe is equivalent to the hybrid parameter h21. The transistor hybrid parameter is a measure of the output short circuit forward current gain. The transistor equivalent parameter is a ratio of the currents across two terminals.