Q. The main advantage of using micro waves for communications is

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Q. A line of length less than λ/4 and open circuited at far end behaves as

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Q. The beam of a radar should be

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Q. TE₁₀ mode of propagation of electromagnetic energy in waveguides can be thought of as

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Q. Consider the following statement:
SWR of a transmission line is infinite when the load is

1. a short circuit
2. a complex impedance
3. an open circuit
4. a pure reactance

Which of the above statements are correct?

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Q. In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.

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Q. In TE₁₀ mode the largest electric field in a rectangular wave guide, occurs

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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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