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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 3
21.
Velocity of the wave when it passes from air into sphere
decreases
increases
same
no change
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
The ratio of the directivity of an end fire antenna to that of a broadside antenna is
2
3
4
5
Answer: Option
Explanation:

In Broadside, D = 2n

In End fire D = 4n.

23.
If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is given by
E(z, t) = 10 cos (2p x 107t - 0.1 pz) volt/metre, then the velocity of the travelling wave is
3.0 x 108 m/sec
2 x 108 m/sec
6.28 x 107 m/sec
2 x 107 m/sec
Answer: Option
Explanation:

E(z, t) = 10 cos (2p x 107t - 0.1 pz)

f = 107 Hz, β = 0.1p

24.
The absorption of radio waves by atmosphere depends on
their frequency
their distance from the transmitter
the polarization of atmosphere
the polarization of the waves
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
For transmission-line matching over range of frequencies, it is best to use a
single stub of adjustable position
double stub
broadband directional coupler
balun
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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