1.

Find the Y – parameter Y21 in the circuit shown below.(a) -1/4(b) 1/4(c) 1/2(d) -1/2This question was posed to me during an interview.My question is taken from Short Circuit Admittance(Y) Parameters topic in portion Two-Port Networks of Network Theory

Answer»

The correct option is (a) -1/4

The EXPLANATION is: After SHORT circuiting b-b’, the equation will be -I2=I1 × 2/4=I1/2 and -I2 = V1/4 and on SOLVING and substituting we GET Y21 = I2/V1=-1/4 mho.



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