# Network Theory Questions and Answers – Inter Connection of Two-Port Networks

This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Inter Connection of Two-Port Networks”.

1. In the circuit shown below, find the Z-parameter Z11.

a) 1
b) 2
c) 3
d) 4

Explanation: The Z –parameter Z11 is V1/I1, port 2 is open circuited. V1 = (1+2)I1 => V1/I1 = 3 and on substituting, we get Z11 = 3Ω.

2. In the circuit shown below, find the Z-parameter Z12.

a) 4
b) 3
c) 2
d) 1

Explanation: The Z-parameter Z12 is V2/I1 |I2=0. On open circuiting port 2 we obtain the equation, V1 = (2) I2 => V1/I1 = 2. On substituting we get Z12 = 2Ω.

3. In the circuit shown below, find the Z-parameter Z21.

a) 2
b) 4
c) 1
d) 3

Explanation: The Z-parameter Z21 is V2/I1 |I2=0. On open circuiting port 2, we get V2 = (2)I1 => V2/I1 = 2. On substituting we get Z21 = 2Ω.

4. In the circuit shown below, find the Z-parameter Z22.

a) 3
b) 2
c) 4
d) 1

Explanation: The Z-parameter Z21 is V2/I2 |I1=0. This parameter is obtained by open circuiting port 1. So we get V2 = (2 + 1)I2 => V2 = 3(I2) => V2/I2 = 3. On substituting Z21 = 3Ω.

5. In the circuit shown below, find the Z-parameter Z11.

a) 10
b) 15
c) 20
d) 25

Explanation: The Z –parameter Z11 is V1/I1, port 2 is open circuited. V1 = (10 + 5)I1 => V1/I1 = 15 and on substituting, we get Z11 = 2.5Ω.

6. In the circuit shown below, find the Z-parameter Z12.

a) 15
b) 10
c) 5
d) 1

Explanation: The Z-parameter Z12 is V2/I1 |I2=0. On open circuiting port 2 we obtain the equation, V1 = (5) I2 => V1/I1 = 5. On substituting we get Z12 = 5Ω.

7. From the circuits shown below, find the combined Z-parameter Z11.

a) 8
b) 18
c) 28
d) 38

Explanation: The Z-parameter Z11 is Z11 = Z11x + Z11y and Z11x = 3, Z11y = 15. On substituting we get Z11 = 3 +15 = 18Ω.

8. From the circuits shown below, find the combined Z-parameter Z12.

a) 4
b) 5
c) 6
d) 7

Explanation: The Z-parameter Z12 is Z12 = Z12x + Z12y and we have Z12x = 2, Z12y. On substituting we get Z12 = 2 + 5 = 7Ω.

9. From the circuits shown below, find the combined Z-parameter Z21.

a) 7
b) 6
c) 5
d) 4

Explanation: The Z-parameter Z21 is Z21 = Z21x + Z21y and we have Z21x = 2, Z21y = 5. On substituting we get Z21 = 2 + 5 = 7Ω.

10. From the circuits shown below, find the combined Z-parameter Z22.

a) 38
b) 28
c) 18
d) 8

Explanation: The Z-parameter Z22 is Z22 = Z22x + Z22y and we have Z22x = 3, Z22y = 25. On substituting we get Z22 = 3 +25 = 28Ω.

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