Q. The radiation pattern of helical antenna (axial mode) is represented by

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Q. Antenna aperture efficiency is given by

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Q. The characteristic equation of plane wave in E independent of two dimensions y and z is

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Q. A broadside array is shown in figure in which the elements are placed at equal distances. The direction of maximum radiation is represented by

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Q. Which one of the following is correct expression. Where t is torque, B magnetic field, M is the moment

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Q. For an incident wave which is normal on the perfect dielectric the reflection factor is given by (where ε1 and ε2 are the permittivities of 1st and 2nd medium respectively)

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Q. For EM wave propagation in free space, the free space is defined as

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Q. A field given below can be

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Q. If a plane electromagnetic wave satisfies the equation given below, the wave propagates in the (at an angle of 45° between the x and z direction)

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Q. Laplace equation in cylindrical co-ordinates is given by

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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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