Electromagnetic-theory Questions Set 89:
Find the transmission coefficient of a wave when the return loss is 6 decibels.
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If the antenna diameter is increased four times, the maximum range is increased by a factor of:
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When the curl of an electric field is equal to zero, the electric field is said to be
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Neper is used as the unit of attenuation constant. 1 neper (Np) = __________
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For an n-element isotropic antenna array, how many major lobes can be found in the corresponding radiation pattern?
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Sparking is discouraged in a DC motor because
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Two circular coils of diameter 10 cm and 20 cm have the same number of turns. The ratio of the magnetic field induction produced at the center of the coils when connected in series is
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A rectangular metal waveguide filled with a material of relative permittivity εr = 9 has the inside dimensions of 3.0 cm x 1.2 cm. The cut-off frequency for the dominant mode is:
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The torque developed by a DC motor depends on
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"Poisson's equation is defined or is valid if and only if the region is homogeneous."
Comment on the accuracy of the above statement.
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