Q. Hollow waveguides are used as transmission lines at frequencies

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Q. To ensure that only dominant TE₁₀ mode propagates in a rectangular waveguide, the operating frequency

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Q. In a microwave power measurement using bolometer, the principle of working is variation of

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Q. Z₀ = (Zoc Zsc)^0.5

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Q. A microwave junction is matched at all ports if the S matrix

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Q. Assertion (A): A line of length slightly more than λ/4 and open circuited at far end is equivalent to an inductive reactance.

Reason (R): A line of length slightly more than λ/4 and short circuited at far end behaves as a capacitive reactance.

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Q. The total power radiated from an antenna system is determined by imagining that the antenna is at the centre of a very large

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Q. The AM, PM, and TV broadcast frequencies are

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Q. Assertion (A): For a reciprocal microwave junction the S matrix is symmetrical.

Reason (R): In a symmetrical matrix Sij = Sji.

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Q. In TE mode of waveguide Ez = 0

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Q. The primary constants of a transmission line are

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Q. As compared to their values in free space

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Q. Characteristic impedance of a coaxial cable is inversely proportional to √∈r.

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Q. A rectangular waveguide has a discontinuity in the form of reduced narrow dimension. In the equivalent circuit this discontinuity can be represented by

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Q. Depth of penetration does not depend on frequency.

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Q. TE₀₁ mode of propagation of electromagnetic energy

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Q. Assertion (A): Slotted line is frequently used for microwave measurements.Reason (R): The unknown impedance is mounted at the end of slotted line.

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Q. Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have

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Q. The following components are used to measure power output of a 2 kW TWT amplifier

1. TWT
2. Low pass/High pass filter
3. Low power 20 dB attenuator
4. 40 dB directional coupler with matched load
5. Power meter

The correct sequence of connections of these components is:

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Q. Which part of radio spectrum is more crowded?

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