# 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, Zij can be given in terms of voltage and current of a microwave network as:
a) ZIJ = VI/IJ
b) ZIJ = VIIJ
c) 1//ZIJ = 1/JIVI
d) VIJ = IJ/JI

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, Z21=4+j is said to be
a) Reciprocal network
b) Lossless network
c) Lossy network
d) None of the mentioned