Q. The equation ∇ . J = 0 is called

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Q. The voltage and current distributions on a grounded λ/4 dipole (Marconi antenna) are similar to those of a half wave dipole in space.

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Q. The useful magnetic flux obtainable from any closed surface is

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Q. Which of the following statement is false?

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Q. It is desired to reduce the reflection at an air porcelain by use of 7/4 plate (for Porcelain μ = 40, and εr = 7). The thickness of the polystyrene plate required at 10 GHz will be

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Q. Conductivity is measured in terms of

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Q. A satellite that simply reflect back the signals from one region of the earth to the other region is known as

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Q. In an home T.V. receiver, the leed in from the antenna is

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Q. The transmitting antennas for lower frequencies (below 500 kHz) are generally

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Q. The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a

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Q. A time varying field is applied to a circuit with a capacitor- which of the following statements is correct?

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Q. A waveguide operated below cut off frequency can be used as

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Q. Which of the following will increase the antenna radiation efficiency?

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Q. Which of the following statement is incorrect?

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Q. The critical frequency of 'F' layer is greater than 30 MHz.

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Q. Radiation intensity in a given direction is the

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Q. When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .

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Q. Whenever a wave is incident on a perfect conductor then the reflection coefficient is

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Q. Which of the following statement is false?

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Q. In case of surface waves the field strength at a point is directly proportional to

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