# Co-axial lines MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Co-axial lines”.

1. The dominant waveguide mode of a co axial line is:
a) TE11 mode
b) TE01 mode
c) TM01 mode
d) TEM mode

2. In a co axial line with inner and outer diameters of 0.0645 and 0.0215 inches and a Teflon di electric with ∈r=2.2. The highest usable frequency before the TE11 waveguide mode starts to propagate is:
a) 16.8 GHz
b) 117.7 GHz
c) 15.3 GHz
d) 8.4 GHz

3. What are the modes of propagation that a co axial line supports?
a) TM, TE mode
b) TM, TE, TEM mode
c) TM, TEM mode
d) TE, TEM mode

4. If a wave guide has he inner and outer conductor diameters of 0.0645 and 0.0215 inches respectively for a co axial lines then the cut off wave number is:
a) 298
b) 300
c) 285
d) 123

5. In television systems the characteristic impedance of the cables used is:
a) 75Ω
b) 150Ω
c) 100Ω
d) 50Ω

6. What are the connectors used in pairs called?
a) Jack and plug
b) Male and female connectors
c) Both the mentioned
d) None of the mentioned

7. The commercially used co axial cable and connectors used has a characteristic impedance is:
a) 50Ω
b) 100Ω
c) 33.34Ω
d) 66.6Ω

8. SWR standing wave ratio has to be ________for co axial connector.
a) Low
b) High
c) Infinite
d) Cannot be calculated

9. The frequency range for N type co axial connector is:
a) 8-12 GHz
b) 11-18 GHz
c) 14-20 GHz
d) 2-8 GHz

10. The frequency range of SMA co-axial connector used most commonly is:
a) 18-25 GHz
b) 25-50 GHz
c) 11-18 GHz
d) 8-12 GHz