Question

In the circuit given below, the value of the hybrid parameter h11 is _________

(a) 10 Ω

(b) 7.5 Ω

(c) 5 Ω

(d) 2.5 Ω

The question was asked in class test.

Origin of the question is Hybrid (h) Parameter topic in chapter Two-Port Networks of Network Theory

Answer 1

Correct choice is (b) 7.5 Ω

To explain I would say: Hybrid parameter h11 is given by, h11 = \(\frac{V_1}{I_1}\), when V2 = 0.

Therefore short circuiting the terminal Y-Y’, we get,

 V1 = I1 ((5 || 5) + 5)

= I1 \(\left(\left(\frac{5×5}{5+5}\right)+5\right)\)

= 7.5I1

∴ \(\frac{V_1}{I_1}\) = 7.5

Hence h11 = 7.5 Ω.