Q. Find the noise factor for an antenna at 27°C with equivalent noise temperature 30°K

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Q. The displacement flux density at a point on the surface of a perfect conductor is D = 2(ax - √3 az)c/m² pointing away from the surface. The charge density at that point c/m² will be

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Q. Characteristic impedance of a transmission line is 50 Ω. Input impedance of the open circuited line. Zoc = 100 + J150 Ω. When transmission line is short circuited, then value of the input impedance will be

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Q. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is

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Q. A parallel polarized wave is incident from air into paraffin having relative permittivity 3, the value of its Brewster angle is

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Q. In a conductor which of the following relations hold good?

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Q. The radiation resistance of a λ/16 wire dipole in free space will be nearly

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Q. The phase angle corresponding to λ/4 in a standing-wave pattern is

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Q. A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the frequency is 3 GHz, and b = 1 cm.

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Q. Calculate the directivity of an antenna for θE = 30°, θH = 60

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Q. Which one of the following potential does not satisfy Laplace's equations?

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Q. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.

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Q. Calculate wave impedance for TE mode

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Q. In a 100 turn coil, if the flux through each turn is (t³ - 2t)mWb, the magnitude of the induced emf in the coil at a time of 4 sec is

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Q. A (75 - j 40) W load is connected to a co-axial line of z0 = 75ω at 6 MHz. The load matching on the line can be accomplished by connecting

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Q. The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ε = 80 ε0. The surface charge density on the conductor is ((ε0 = 10¯⁹/36π)F/m)

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Q. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.

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Q. A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is

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Q. Calculate the wave impedance for TM mode in rectangular waveguide for dominant mode at 3 GHz having

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Q. The divergence of the electric field intensity at any point equals

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