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Electromagnetic theory miscellaneous

Electromagnetic theory miscellaneous

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Electromagnetic Theory

Electromagnetic theory miscellaneous

Compared with equivalent transmission lines, 3-GHz waveguides— (indicate false statement)

1. Are less lossy
1. Can carry higher powers
1. Are less bulky
1. Have lower attenuation

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NA

Correct Option: C

NA

The main difference between the operation of transmission lines and waveguides is that—

1. The latter are not distributed, like transmission lines
1. The former can use stubs and quarter-wave transformers, unlike the latter
1. Transmission lines use the principal mode of propagation, and therefore do not suffer from low-frequency cutoffs
1. Terms such as impedance matching and standing wave ratio cannot be applied to waveguides

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The main difference between the operation of transmission lines and waveguides is that transmission lines use the principal mode of propagation and therefore do not suffer from low-frequency cut-off.

Correct Option: C

The main difference between the operation of transmission lines and waveguides is that transmission lines use the principal mode of propagation and therefore do not suffer from low-frequency cut-off.

The wavelength of a wave in a waveguide—

1. Is greater than in free space
1. Depends only on the waveguide dimensions and the free-space wavelength
1. Is inversely proportional to the phase velocity
1. Is directly proportional to the group velocity

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The wavelength of a wave in a waveguide is greater than in free space.

Correct Option: A

The wavelength of a wave in a waveguide is greater than in free space.

Waveguides are used mainly for microwave signals because—

1. They depend on straight-line propagation which applies to microwaves only
1. Losses would be too heavy at lower frequencies
1. There are no generators powerful enough to excise them at lower frequencies
1. They would be too bulky at lower frequencies

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Waveguides are used mainly for microwave signals because they would be too heavy at lower frequencies.

Correct Option: D

Waveguides are used mainly for microwave signals because they would be too heavy at lower frequencies.

When electromagnetic waves are propagated in a waveguide—

1. They travel along the broader walls of the guide
1. They are reflected from the walls but do not travel along them
1. They travel through the dielectric without touching the walls
1. They travel along all four walls of the waveguide

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When electromagnetic waves propagated in a waveguide they are reflected from the walls but do not travel along them

Correct Option: B

When electromagnetic waves propagated in a waveguide they are reflected from the walls but do not travel along them

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