Test: Electromagnetic Field Theory - 7 - Electronics and Communication Engineering (ECE) MCQ
25 Questions MCQ Test Electromagnetics - Test: Electromagnetic Field Theory - 7
Whenever a wave is incident on a perfect conductor then the reflection coefficient is
Which one set of the following Maxwell's equation gives the basic idea of radiation ?
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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 __________ .
Power gain and directivity related with, Gp power gain, Gd directive gain
Radiation intensity in a given direction is the
The capacitance between two spheres, whose separation is very much larger than their radii R, is given approximately as
If ωε is the displacement current factor and s is conduction current density factor then which of the following statements is incorrect?
Which of the following statement regarding waveguides is incorrect?
The potential that appears at a point in space due to the current which caused it is called potential
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
Which of the following statement is false?
The useful magnetic flux obtainable from any closed surface is
The voltage and current distributions on a grounded λ/4 dipole (Marconi antenna) are similar to those of a half wave dipole in space.
It is best to use for coupling a coaxial line to a parallel wire transmission line.
In H-plane metal plate lens the travelling wave front is
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
Which of the following is not between F2 layer and D layer?
The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a
The transmitting antennas for lower frequencies (below 500 kHz) are generally
In an home T.V. receiver, the leed in from the antenna is
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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11 videos|64 docs|89 tests
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11 videos|64 docs|89 tests
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