Q. Which of the following relations is valid?

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Q. The directive gain of an antenna is given by

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Q. Which of the following relations is correct?

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Q. In case of static electric field Maxwell's divergence equation states that:

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Q. Voltage standing wave pattern in a loss less transmission line with characteristic impedance 50 Ω and a resistive load is shown in the figure. The value of load resistance is

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Q. In figure the voltage distribution on a vertical earthed antenna is represented by

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Q. For a good conducting medium the intrinsic impedance is

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Q. Given figure shows a 90° sector of spherical reflector with vertex 'V', centre of curvature 'C' and equal distances VD, DF, FE and EC. When a beam of EM wave is incident parallel to the axis, all the energy will pass through the region

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Q. Two co-axial cylindrical sheets of charge are present in free space fs = 5 c/m² at r = 2 m and ρs = -2 c/m² at r = 4 m, The displacement flux density D at r = 3 m is

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Q. For space propagation, what will be the electric field strength at receiving antenna

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Q. In a vertical earthed antenna the base input impedance will be inductive for a height

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Q. Voltage standing wave pattern in a loss less transmission line with characteristic impedance 50 Ω and a resistive load is shown in the figure. Reflection coefficient is given by

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Q. The electric field of an EM wave propagating in the z direction given by following equation. The wave is

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Q. The radiation pattern of two element collinear array is represent in

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Q. A lossless transmission line is connected to two identical voltage source as shown in figure. The impedance measured at the midpoint AA' is

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Q. For a quarter wave transformer, characteristic impedance is related with input and load impedances as

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Q. What does the following expression represent?

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Q. For radiation field of an antenna at a distance r varies as

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Q. The attenuation factor α and phase shift factor β for a wave propagated in a good dielectric having σ/ωε >> 1 are given by

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Q. The attenuation constant in case of a transmission line is

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