# Which of the following expression is true in case of short circuit parameters?

Which of the following expression is true in case of short circuit parameters?

(a) I2 = Y21I1 + Y22 I2

(b) V2 = Y21I1 + Y22 V2

(c) I2 = Y21V1 + Y22 V2

(d) I2 = Y21V1 + Y22 I2

This question was addressed to me in an online interview.

Query is from Short Circuit Admittance(Y) Parameters topic in chapter Two-Port Networks of Network Theory

Select the correct answer from above options

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by (557k points)
Right answer is (c) I2 = Y21V1 + Y22 V2

The best I can explain: The expression relating the voltages V1, V2 and current is I2 and short circuit parameters Y11, Y12 is I2 = Y21V1 + Y22V2.