1.

In the circuit given below, the value of the hybrid parameter h21 is _________(a) 10 Ω(b) 0.5 Ω(c) 5 Ω(d) 2.5 ΩThe question was asked by my school teacher while I was bunking the class.My question is based upon Advanced Problems on Two Port Network in division Two-Port Networks of Network Theory

Answer»

The CORRECT choice is (B) 0.5 Ω

Easiest EXPLANATION: Hybrid PARAMETER h21 is given by, h21 = \(\frac{I_2}{I_1}\), when V2 = 0.

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

-5 I2 – (I2 – I1)5 = 0

Or, -I2 = I2 – I1

Or, -2I2 = -I1

∴\(\frac{I_2}{I_1} = \frac{1}{2}\)

 Hence h21 = 0.5 Ω.



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