Q. For transmission of waveform a dielectric medium of permittivity ε1 into a dielectric medium of lower permittivity ε2 , (ε1 > ε2) the critical angle of incidence θc (relative to the interface) is given by

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Q. Maximum power transfer will take place in a practical antenna if (XL = Load Reactance, XA Antenna Reactance)

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Q. VSWR is related with reflection co-efficient as

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Q. Which of the following statement is incorrect?

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Q. The propagation constant of a transmission line is

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Q. Many circles are drawn in a Smith chart used for transmission line calculations. The circle shown in the figure represents

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Q. Which one set of the following Maxwell's equation gives the basic idea of radiation ?

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Q. Power gain and directivity related with, Gp power gain, Gd directive gain

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Q. The number of free electrons in acceptor atom is

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Q. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be

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Q. Which of the following should dominant wave have?

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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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