# Impedance and Admittance Matrices MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Impedance and Admittance Matrices”.

1. The one below is the only micro wave network element that is a TEM line:

a) Co-axial cable

b) Rectangular wave guide

c) Circular wave guide

d) Surface wave guide

2. The relation between voltage, current and impedance matrices of a microwave network is:

a) [V] = [Z][I].

b) [Z] = [V][I].

c) [I] = [Z][V].

d) [V] = [Z]-[I].

3. The one below among others is not a type TEM line used in microwave networks:

a) Co-axial wire

b) Micro strip line

c) Strip lines

d) Surface guide

4. The relation between voltage, current and admittance matrices of a microwave network is:

a) [I] = [Y] [V].

b) [Y] = [V] [I].

c) [I] = [Z] [V].

d) [V] = [Z]-1[I].

5. The element of a Z matrix, Z_{ij} can be given in terms of voltage and current of a microwave network as:

a) Z_{IJ} = V_{I}/I_{J}

b) Z_{IJ} = V_{I}I_{J}

c) 1//Z_{IJ} = 1/J_{I}V_{I}

d) V_{IJ} = I_{J}/J_{I}

6. In a 2 port network, if current at port 2 is 2A and voltage at port 1 is 4 V, then the admittance Y₂₁ is:

a) 0.5 Ʊ

b) 8 Ʊ

c) 2 Ʊ

d) 4 Ʊ

7. Admittance and impedance matrices of a micro waves network are related as:

a) [Y] = [Z]-1.

b) [Y] = [Z].

c) [V] = [Z] [Z]-1.

d) [Z] = [V] [V]-1.

8. In a two port network, if current at port 2 is 2A and voltage at port 1 is 4V, then the impedance Z₁₂ is:

a) 2 Ω

b) 8 Ω

c) 0.5 Ω

d) Insufficient data

9. For a reciprocal network, Z matrix is:

a) A unit matrix

b) Null matrix

c) Skew symmetric matrix

d) Symmetric matrix

10. For a lossless network, the impedance and admittance matrices are:

a) Real

b) Purely imaginary

c) Complex

d) Rational

11. The matrix with impedance parameters Z₁₁=1+j, Z₁₂=4+j, Z₂₂=1, Z_{21}=4+j is said to be

a) Reciprocal network

b) Lossless network

c) Lossy network

d) None of the mentioned