Q. Distilled water at 25°C is characterized by σ = 1.7 x 10¯⁴ mho/m and ε = 78 ε₀ at a frequency of 3 GHz. Its loss tangent is (ε = 10¯⁹/36π F/m)

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Q. The input impedance of short-circuited line of length l where l < λ/4

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Q. If the height of transmitting and receiving antenna in a LOS system are 49 meter and a 9 meter respectively then the distance up to which communication may be possible is about

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Q. In a line VSWR of a load is 6 dB. The reflection coefficient will be

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Q. The refractive index of E layer at frequency of √(81N)

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Q. A wavelength of 1 mm could be expected in

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Q. The numerical value of directivity of current element of half-wave dipole is 1.76 and 2.15 dB respectively. The directive gain of half-wave dipole over current element will be

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Q. The maximum effective aperture of an antenna which is operating at wavelength of 2 m and has directivity of 100 is

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Q. The waveguides compared to equivalent transmission lines at low frequency are

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Q. The current distribution of a half wave dipole is

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Q. Cassergain feed is used with a parabolic reflector to

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Q. For the same length of arrays, half power beam-width of binomial array

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Q. The effective electrical length of an antenna is __________ its physical length

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Q. The direction in a Yagi Uda antenna is longer than the radiating element.

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Q. The relative permeability is taken as unity for which of the following?

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Q. The disturbance from adjacent power lines is known as

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Q. Magnesium is alloyed with conducting materials for antenna primarily with the purpose of

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Q. Which of the following term applies to troposcatter propagation?

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Q. Maximum effective aperture of a λ/2 antenna is

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Q. Which of the following wave remains unaffected during day and night?

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