Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 8 (Q.No. 27)
27.
A two port network shown below is external dc sources. The voltages and the currents are measured with voltmeters V1 V2 and ammeter A1 A2 (all assumed to be ideal), as indicated. Under following switch conditions, the readings obtained are:
(i) S1 - Open, S2 - Closed A1 = 0A, V1 = 4.5 V, V2 = 1.5 V, A2 = 1 A
(ii) S1 - Closed, S2 - Open A1 = 4A, V1 = 6 V, V2 = 6 V, A2 = 0 A
The z-parameter matrix for this network is
(i) S1 - Open, S2 - Closed A1 = 0A, V1 = 4.5 V, V2 = 1.5 V, A2 = 1 A
(ii) S1 - Closed, S2 - Open A1 = 4A, V1 = 6 V, V2 = 6 V, A2 = 0 A
The z-parameter matrix for this network is
Answer: Option
Explanation:
V1 = Z11I1 + Z12I2
V2 = Z22I + Z22I2
Using the given information; S1-open, S2-closed
4.5 = Z121 ⇒Z12 = 4.5
1.5 = Z221 ⇒ Z22 = 1.5
S1-closed, S2-open
6 = Z111 ⇒ Z11 = 1.5
6 = Z214 ⇒ Z21 = 1.5
Thus Z matrix = 
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