Q. A vertical loop antenna, like a horizontal dipole, is vertically polarised.

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Q. The attenuation in a waveguide near the cut off frequency is

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Q. The electric flux and field intensity inside a conducting sphere is

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Q. T.V. antennas are usually

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Q. Select the correct relation

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Q. Diffraction of electromagnetic wave

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Q. Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is

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Q. For a plane good conductor, skin depth varies

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Q. Measurement of radiation resistance by reflection method is suitable for

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Q. A loss less transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is

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Q. A higher directivity is specified by

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Q. The best excited reflector from a wave guide is

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Q. Consider an arbitrary distribution of conducting bodies in a charge free space according to the uniqueness theorem, which of following are required to be specified in order that the field is uniquely determined everywhere?

1. Total charge on each conductor
2. Potential at each conductor surface
3. Potential at same of conductor and total charge on the remainder
4. Total charge as well as potential gradient on each conductor surface

Select the correct answer using the codes given below codes

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Q. Which of the following is a better propagation mode to propagate television frequency modulation and radar signals?

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Q. Antenna used for T.V. broadcasting is

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Q. For a rectangular waveguide (a x b, a > b) to support only the TE₁₀ mode at wavelength which one of the following pairs of in equalities is to be satisfied?

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Q. For an elliptically polarized wave incident on the interface of a dielectric at the Brewster angle the reflected wave will be

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Q. Which of the antenna is best excited by a waveguide?

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Q. An end fire array consisting of several half-wave lengths of directive gain 40, then array length will be

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Q. Loop antennas are mostly employed for direction finding (DF) purposes because they are small and hence portable.

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