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For the circuit given below, the value of the hybrid parameter h21 is ___________(a) 0.6 Ω(b) 0.5 Ω(c) 0.3 Ω(d) 0.2 ΩI had been asked this question in an interview for job.This interesting question is from Advanced Problems on Two Port Network topic in division Two-Port Networks of Network Theory

Answer»

Right answer is (b) 0.5 Ω

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,

-50 I2 – (I2 – I1)50 = 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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