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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 9
6.
Given that , if the radiation intensity of an antenna is proportional to sin2 θ, where θ is the elevation angle, the antenna directivity will be
Answer: Option
Explanation:
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7.
The term critical frequency denotes
the lowest frequency that is reflected by the ionosphere
the highest frequency that is reflected by the ionosphere at vertical distance
the lowest frequency by which communication is possible between two given points
none of the above
Answer: Option
Explanation:
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8.
The important postulate arising out of Maxwell's modification of Ampere's law is
a changing magnetic field produces an electric field
a changing electric field produces a magnetic field
a motional e.m.f. is produced by a coil moving in a magnetic field
a steady current produce a magnetic field
Answer: Option
Explanation:
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9.
Which of the following is not a wideband antenna?
Marconi
Discone
Helical
Folded dipole
Answer: Option
Explanation:
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10.
The polarization phenomena in Faraday rotation
is non-reciprocal
exists along perpendicular direction
exists along the axis of array
does not exist
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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