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 Z_{11}.

a) 1

b) 2

c) 3

d) 4

View Answer

Explanation: The Z –parameter Z

_{11}is V

_{1}/I

_{1}, port 2 is open circuited. V

_{1}= (1+2)I

_{1}=> V

_{1}/I

_{1}= 3 and on substituting, we get Z

_{11}= 3Ω.

2. In the circuit shown in question 1, find the Z-parameter Z_{12}.

a) 4

b) 3

c) 2

d) 1

View Answer

Explanation: The Z-parameter Z

_{12}is V

_{2}/I

_{1}|I

_{2}=0. On open circuiting port 2 we obtain the equation, V

_{1}= (2) I

_{2}=> V

_{1}/I

_{1}= 2. On substituting we get Z

_{12}= 2Ω.

3. In the circuit shown in question 1, find the Z-parameter Z_{21}.

a) 2

b) 4

c) 1

d) 3

View Answer

Explanation: The Z-parameter Z

_{21}is V

_{2}/I

_{1}|I

_{2}=0. On open circuiting port 2, we get V

_{2}= (2)I

_{1}=> V

_{2}/I

_{1}= 2. On substituting we get Z

_{21}= 2Ω.

4. In the circuit shown in question 1, find the Z-parameter Z_{22}.

a) 3

b)2

c) 4

d) 1

View Answer

Explanation: The Z-parameter Z

_{21}is V

_{2}/I

_{2}|I

_{1}=0. This parameter is obtained by open circuiting port 1. So we get V

_{2}= (2 + 1)I

_{2}=> V

_{2}= 3(I

_{2}) => V

_{2}/I

_{2}= 3. On substituting Z

_{21}= 3Ω.

5. In the circuit shown below, find the Z-parameter Z_{11}.

a) 10

b) 15

c) 20

d) 25

View Answer

Explanation: The Z –parameter Z

_{11}is V

_{1}/I

_{1}, port 2 is open circuited. V

_{1}= (10 + 5)I

_{1}=> V

_{1}/I

_{1}= 15 and on substituting, we get Z

_{11}= 2.5Ω.

6. In the circuit shown in question 5, find the Z-parameter Z_{12}.

a) 15

b) 10

c) 5

d) 1

View Answer

Explanation: The Z-parameter Z

_{12}is V

_{2}/I

_{1}|I

_{2}=0. On open circuiting port 2 we obtain the equation, V

_{1}= (5) I

_{2}=> V

_{1}/I

_{1}= 5. On substituting we get Z

_{12}= 5Ω.

7. From the circuits shown in question 1 in question 5, find the combined Z-parameter Z_{11}.

a) 8

b) 18

c) 28

d) 38

View Answer

Explanation: The Z-parameter Z

_{11}is Z

_{11}= Z

_{11x}+ Z

_{11y}and Z

_{11x}= 3, Z

_{11y}= 15. On substituting we get Z

_{11}= 3 +15 = 18Ω.

8. From the circuits shown in question 1 in question 5, find the combined Z-parameter Z_{12}.

a) 4

b) 5

c) 6

d) 7

View Answer

Explanation: The Z-parameter Z

_{12}is Z

_{12}= Z

_{12x}+ Z

_{12y}and we have Z

_{12x}= 2, Z

_{12y}. On substituting we get Z

_{12}= 2 + 5 = 7Ω.

9. From the circuits shown in question 1 in question 5, find the combined Z-parameter Z_{21}.

a) 7

b) 6

c) 5

d) 4

View Answer

Explanation: The Z-parameter Z

_{21}is Z

_{21}= Z

_{21x}+ Z

_{21y}and we have Z

_{21x}= 2, Z

_{21y}= 5. On substituting we get Z

_{21}= 2 + 5 = 7Ω.

10. From the circuits shown in question 1 in question 5, find the combined Z-parameter Z_{22}.

a) 38

b) 28

c) 18

d) 8

View Answer

Explanation: The Z-parameter Z

_{22}is Z

_{22}= Z

_{22x}+ Z

_{22y}and we have Z

_{22x}= 3, Z

_{22y}= 25. On substituting we get Z

_{22}= 3 +25 = 28Ω.

**Sanfoundry Global Education & Learning Series – Network Theory.**

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