Q. Which part of radio spectrum is more crowded?

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Q. The most commonly used magnetron is

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Q. The effect of earth's magnetic field on radiowaves is minimum when

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Q. A line of characteristic impedance Z₀ branches into two line each with characteristic impedance Z₀. The refracted voltage is

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Q. The resistance values of a PIN diode under positive bias and negative bias respectively are about

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Q. A PIN diode can be used

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Q. What is the numerical aperture an optical fiber when critical angle is 30°?

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

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Q. In TE₁₀ mode of rectangular waveguide

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Q. Reflection from the object to be measured is significant only when the wavelength is

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Q. The speed at which axial electric field due to signal advances in a TWT is equal to

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Q. Slotted line can be used for measurement of high frequencies

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Q. In a waveguide the dielectric region is generally

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Q. A line is excited by a 100 V, 200 ohm source and is terminated by 100 Ω resistance. If the voltage on line reaches steady value in 80 ns, the natural resonant frequency is

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

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Q. Klystron amplifier is not used to amplifier very weak microwave signals due to

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Q. Which of the following modes in circular waveguides are circularly symmetric?

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Q. Which of the following lines behaves as infinite line?

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Q. A rectangular waveguide has two stubs each length λ/4 connected at the source end. The stubs are short circuted. Then

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Q. Performance of a PIN diode switch is represented by

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