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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 11
16.
Zoning is used with a dielectric antenna in order to
permit pin-point focusing
reduce the bulk of the lens
increase the bandwidth of the lens
correct the curvature of the wavefront from a horn that is too short
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
For aeroplane and navigation frequency band is
VLF
UHF
VHF
EHF
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
Poynting vector signifies which of the following?
Power density vector producing electrostatic field
Power density vector producing electromagnetic field
Current density vector producing electrostatic field
Current density vector producing electromagnetic field
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Which one is correct?
Sky wave propagation (2 to 30 MHz)
Space wave propagation (> 30 MHz)
Tropospheric propagation (> 300 MHz)
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
When a magnetic circuit is compared with an electric circuit, the equivalent of the magnetic flux is
the conductivity of the lines
the voltage of the source
the current in the lines
the conductance of the load
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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