# Field Analysis of Transmission Lines MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Field Analysis of Transmission Lines”.

1. In a two wire transmission line , if the distance between the lines is 60mm and the radii is 10 mm , then the capacitive reactance of the line when operated at 12.5 GHz is

a) 20 pF

b) 21.13 pF

c) 23 pF

d) 12 pF

2. For a parallel plate type of a transmission line, then expression for conductance of the line is:

a) ∈(ω)w/d

b) 2R_{x}/x

c) μ/2π ln(w/d)

d) μ/π cosh^{-1}(w/2d)

3. In a two wire transmission line, if the distance between the lines is 20 mm and the radii is 5 mm then the inductance of the line is:

a) 0.1 µH

b) 0.526 µH

c) 0.9 µH

d) 1 µH

4. One of the Maxwell‘s curl equation that is satisfied inside a coaxial line is:

a) ∇×E =-jωµ (vector H)

b) ∇×E =-jωμ(vector E)

c) ∇×H=-jωμ(vector H)

d) ∇×H=jωμ(vector H)

5. Wave impedance of a wave travelling in a medium of a relative permittivity 2 and permeability 4 is

a) 188.5 Ω

b) 200 Ω

c) 300 Ω

d) None of the mentioned

6. Expression for capacitance of a two wire transmission line is

a) ∈’*π/cosh^{-1}(D/2a)

b) μ/π*cosh^{-1}(D/2a)

c) 2π∈/ln(D/2a)

d) ∈”*πω/cosh^{-1}(D/2a)

7. The wave impedance of air for a wave propagating in it is:

a) 377 Ω

b) 345 Ω

c) Insufficient data

d) None of the mentioned

8. For a parallel plate transmission line, if w= 12 mm and the distance between the plates is 2 mm, then the inductance of the transmission line is:

a) 0.2 µH

b) 0.1 µH

c) 0.3 µH

d) 0.4 µH

9. If the distance between the 2 wires in a 2 wire transmission line is 10 mm and the radii 2 mm, then the inductance of the transmission line is:

a) 0.62 µH

b) 1 µH

c) 2 µH

d) None of the mentioned

10. For a parallel plate transmission line, if the complex part of permittivity is 2.5, if the width is 100 mm and the distance between the plates is 10 mm, then the conductance of the transmission line is:

a) 25 Ʊ

b) 30 Ʊ

c) 45 Ʊ

d) None of the mentioned

11. For a parallel plate transmission line, if the series resistance is 10 mΩ/m, and the width is 100 mm, then the resistance of the transmission line is:

a) 0.2 Ω

b) 1 Ω

c) 2 Ω

d) 5 Ω