Electronics and Communication Engineering - Electromagnetic Field Theory

26.
Tropospheric mode of propagation is used in
UHF
VLF
MF
HF
Answer: Option
Explanation:
No answer description is available. Let's discuss.

27.
The skip distance is
same for each layer
independent of frequency
independent of the state of ionisation
independent of transmitted power
Answer: Option
Explanation:
No answer description is available. Let's discuss.

28.
Polystyrene has a relative permittivity of 2.7. If the wave is incident at an angle θi of 30° from air into polystyrene, the angle of transmission will be nearly
0.2°
18°
48°
Answer: Option
Explanation:
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29.
The radiation pattern of helical antenna (axial mode) is represented by
Answer: Option
Explanation:
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30.
Antenna aperture efficiency is given by
Answer: Option
Explanation:
No answer description is available. Let's discuss.