The critical frequency of ‘F’ layer is greater than 30 MHz.
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ECE · all questionsElectromagnetic Field Theory
Electromagnetic Field Theory
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Which of the following statement regarding waveguides is incorrect?
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A rectangular waveguide is a
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Tropospheric scatter is used with frequencies in the
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A Yagi antenna has a driven antenna
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In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as
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The frequency range for satellite communication is
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The static electric field in a conductor is
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The skip distance is the maximum distance upto which ionospheric reflection is possible.
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Parabolic and lens antenna used at
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MUF is depend upon
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The radiation pattern of loop antenna is
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When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon
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If a and b are the dimensions of waveguide then
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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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Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?
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The useful magnetic flux obtainable from any closed surface is
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When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called
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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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The main disadvantage of the two-hole directional coupler is
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