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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 7
16.
A plane EM wave is travelling in an unbound loss less dielectric having μy = 1 and εy = 4, the time average Poynting vector of the wave is 5 W/m3 . The phase velocity vp (assuming velocity of light as 3 x 108 m/sec) is
1.5 x 108 m/sec
3 x 108 m/sec
2.5 x 108 m/sec
0.5 x 108 m/sec
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The phase velocity in a coaxial line is
greater than C
equal to C
less than C
not depend on C
Answer: Option
Explanation:
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18.
D-layer extends approximately from
50 to 90 km
20 to 50 km
90 to 110 km
up to 50 km
Answer: Option
Explanation:
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19.
The ionosphere plays a significant role in radio wave propagation at
high frequency
ultra-high frequencies
microwave frequency
optical frequencies
Answer: Option
Explanation:
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20.
Radiation resistance for wire antenna is
55 Ω
65 Ω
100 Ω
377 Ω
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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