Question

What is the value of I2 if h21 = 2, I1 = 1A, h22 = 0.04 and V2 = 50V?

(a) 2A

(b) 0.2A

(c) 0.4A

(d) 4A

The question was asked in an interview.

The origin of the question is Two-Port Devices and Hybrid Model in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

Answer 1

Right option is (d) 4A

To elaborate: To find the current I2 we use the below mentioned formula. Given values are h21 = 2, I1 = 1A, h22 = 0.04 and V2 = 50V.

I2 = h21I1 + h22V2

I2 = (2) × (1) + (0.04) × (50) = 2 + 2 = 4A.