| 1. | For TE or TM modes of propagation in bounded media, the phase velocity ? | |
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is independent of frequency
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is a linear function of frequency
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is a non-linear function of frequency
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can be frequency-dependent or frequency-independent depending on the source
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Report Question| 2. | For parallel plane waveguides, which is the mode with lowest cut off frequency ? | |
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TM10
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TE10
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TE11
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TEM
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| 3. | For a hollow waveguide, the axial current must necessarily be ? | |
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displacement current only
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conduction current only
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a combination of conduction and displacement currents
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time-varying conduction current and displacement current
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| 4. | Which of the following statements is false ? | |
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Circular waveguides support TE and TM
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Two wire transmission line supports TE mode
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Parallel plate transmission line supports TEM
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Coaxial transmission line supports TEM mode
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| 5. | TEM mode in a coaxial line ? | |
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disallow dc current
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has no cut-off length
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both (a) and (b) above
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None of the above
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| 6. | Which one of the following has the combined characteristics of dielectric, ohmic and radiation losses ? | |
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Coaxial line
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Waveguide
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Twin parallel line
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Microstrip line
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| 7. | Ionospheric propagation is not poisison for microwaves because ? | |
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there will be an abrupt scattering in all directions
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microwaves will be fully absorbed by the ionospheric layers
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there will be dispersion of microwave energy
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microwaves will penetrate through the ionospheric layers
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| 8. | Which one of the following statements regarding a microwave link is incorrect, A microwave link ? | |
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uses reflector type antennas
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uses line of sight propagation
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uses repeaters to increase the range
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can operate from 1 MHz onwards
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| 9. | Bandwidth of the order of 12 MHz can be realized easily using carriers in which range ? | |
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VHF
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UHF
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Microwaves only
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Optical frequency and microwaves
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| 10. | Any uniform plane wave in lossless coaxial transmission line is ? | |
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only TEM wave
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only TE wave
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TE & TM wave
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only TM wave
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