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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Q. As frequency is increased, the skin effect

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Q. In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is

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Q. VTM stands for voltage tunable magnetron.

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Q. Which of the following is used in integrated circuits?

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Q. The π mode of operation of magnetron signifies that

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Q. Consider the following statements (L is the length of array between centres of end antennas and A is wave-length)

1. Width of major lobe between nulls of broad side array and end fire array are different.
2. Directive gain of broadside array and end fire array are different.
3. Directive gain of broadside array is 4(L/λ) .

Which of the above statements are correct?

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