Q. Cassegrain feed is used with a parabolic reflection to

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Q. Which of the wave remains unaffected whether it is a day or night?

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Q. Which of the following is not an omnidirectional antenna?

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Q. The unit of magnetic flux density is

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Q. In a waveguide if TE mode exist for z direction propagation, then

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Q. Critical frequency of a layer in ionosphere

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Q. Which one is correct option?

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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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