Electronics and Communication Engineering - Electromagnetic Field Theory

21.
Television signals are propagated as ground waves.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.

22.
The current distribution along a travelling wave antenna can be written in the form
f(z) = f0e-jβz
f(z) = f0 sin βz
f(z) = f0
f(z) = f0 cos (ωt - βz)
Answer: Option
Explanation:
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23.
The characteristic impedance of loss less transmission line is
L/R
L/C
1/LC
C/L
Answer: Option
Explanation:
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24.
For a hollow waveguide, the axial current must necessarily be
combination of conduction and displacement current
conduction current only
time varying conduction current and displacement current
displacement current only
Answer: Option
Explanation:
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25.
Industrial heating furnaces such as arc and induction furnaces operate on __________ power factor
low leading
low lagging
high leading
very low lagging
Answer: Option
Explanation:
No answer description is available. Let's discuss.