Question

For the circuit given below, the value of the Inverse hybrid parameter g21 is ___________

(a) 0.6 Ω

(b) 0.5 Ω

(c) 0.3 Ω

(d) 0.2 Ω

The question was posed to me in unit test.

This question is from Inverse Hybrid (g) Parameter topic in portion Two-Port Networks of Network Theory

Answer 1

Correct answer is (b) 0.5 Ω

The best explanation: Inverse Hybrid parameter g21 is given by, g21 = \(\frac{V_2}{V_1}\), when I2 = 0.

Therefore short circuiting the terminal Y-Y’, and applying Kirchhoff’s law, we get,

V1 = I1 (10 + 10)

V2 = I1 10

∴  \(\frac{V_2}{V_1}  = \frac{I_1 10}{I_1 20}\) = 0.5

 Hence g21 = 0.5 Ω.