Q. Which modes of circular wave guides have circular symmetry?

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Q. In a microwave resistor the wall thickness is made as small as possible to

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Q. In a klystron amplifier the transit time of electron passing the gap in the cavity should be

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Q. In a cable with ∈r = 4, the wave velocity is

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Q. In a backward wave oscillator the efficiency

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Q. Consider the following statements

1. Fading of signals is generally greatest near radio horizon.
2. Fading of signals is generally greatest in shadow zone.
3. Fading is small when a good optical path is present.

Which of the above statements are correct?

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Q. The use of coaxial microwave line should be restricted to frequencies

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Q. Generally the wall thickness of rectangular waveguide is

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Q. Frequency range for satellite communication is

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Q. For a given operating frequency a waveguide has more power handling capacity than a coaxial line.

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Q. VSWR = Emax/Emin.

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Q. Power monitor and reflectometer use the principle of

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Q. A line slightly longer than λ/4 length and short circuited at far end behaves as

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Q. A waveguide twist is used to change the plane of polarization.

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Q. In a multicavity klystron amplifier the electron velocity of the order of

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Q. At a frequency equal to cutoff frequency in a rectangular wave guide

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Q. In a rectangular waveguide cutoff wavelength for TE₁₀ mode is 8 cm. Then cutoff wavelength for TE₂₀ mode is

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Q. In a coaxial line

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Q. If a and b are the width and height of rectangular wave-guide the cut off wavelength λc for TE₂₀ mode is equal to

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Q. A TEM wave is incident normally on a perfect conductor. The E and H fields at boundary will respectively be

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