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Microwave Engineering MCQs Set-3
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1. The dominant waveguide mode of a co axial line is:
TE11 mode
TE01 mode
TM01 mode
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:
16.8 GHz
117.7 GHz
15.3 GHz
8.4 GHz
3. 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:
298
300
285
123
4. The commercially used co axial cable and connectors used has a characteristic impedance is:
50Ω
100Ω
33.34Ω
66.6Ω
5. In television systems the characteristic impedance of the cables used is:
75Ω
150Ω
100Ω
50Ω
6. SWR standing wave ratio has to be ________for co axial connector.
Low
High
Infinite
Cannot be calculated
7. What are the connectors used in pairs called?
Jack and plug
Male and female connectors
Both the mentioned
None of the mentioned
8. The frequency range for N type co axial connector is:
8-12 GHz
11-18 GHz
14-20 GHz
2-8 GHz
9. The frequency range of SMA co-axial connector used most commonly is:
18-25 GHz
25-50 GHz
11-18 GHz
8-12 GHz
10. Surface waves are typical by a field that decays ______away from the dielectric surface, with most of the field contained in or near the dielectric.
Linearly
Exponentially
Cubical
Field remains a constant
11. Because of the presence of the dielectric, the phase velocity of a surface wave is:
Greater than that in vacuum
Lesser than that in vacuum
Independent of the presence of dielectric
Insufficient data
12. The cutoff frequency in TM1 mode for the propagation of EM waves on dielectric slab of relative permittivity 2.6 and thickness 20 mm is:
6.5 GHz
5.92 GHz
4 GHz
2 GHz
13. Cutoff frequency fC for TEM mode of propagation is:
Fc= (2n-1)c/4d√εr -1
Fc= (2n-c)/2d(√εr-1)
Fc= (2n-1)/4d(√εr)
Fc= (2n-1)/8d√εr – 1
14. The first propagating mode on a grounded dielectric is:
TMO mode
TM1 mode
TM2 mode
TM3 mode
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