Q. An antenna having an effective temperature of 27°K is fed into a microwave amplifier that has an effective noise temperature of 30 K. Calculate the available noise power per unit bandwidth

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Q. Calculate cut off frequency for dominant mode in rectangular waveguide if dimensions are a = 2, b = 1 cm.

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Q. The input impedance for a half dipole if radii of both the antenna is 4 and 8 meter respectively

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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 guide wavelength for dominant mode.

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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 cut off frequency for dominant mode.

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Q. An isolated sphere in air has a radius equal to 1/4πε₀ meter, its capacitance is

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Q. Find cut off wavelength for mode TE11 in a circular waveguide having radius 2 cm. Assume K'a = 1.841

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Q. The refractive index of E layer, if angle of incidence is 30°

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Q. A transmission line having 50 Ω impedance is terminated in a load of (40 + j 30) Ω. The VSWR is

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Q. Calculate the wave number in waveguide having dimensions 4 x 2 cm at 3 GHz

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Q. The I/P impedance of a short circuited quarter wave long transmission line is

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Q. A dipole antenna of λ/8 length has an equivalent total loss resistance of 1.5 Ω. The efficiency of the antenna is

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Q. Gain of an antenna with a circular aperture of diameter 4 meter at frequency of 10 GHz, with directivity 60

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Q. Polarization of a wave is

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Q. Calculate the critical frequency for the E layer if maximum ionic densities are 3 x 10⁶

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Q. A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with εr = 4. The reflection coefficient for the normal incidence is

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Q. A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The transmission coefficient will be

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Q. Maximum effective aperture of an antenna which is operating at a wavelength of 3 meters and has a directivity of 100

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Q. The distance between maxima and minima of a standing wave is

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Q. A TV. transmitting aerial is fixed on top of a 150 metre tower located on a mountain 1200 m height. The range of transmitter is

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