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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 1
31.
Calculate the wave impedance for TM mode in rectangular waveguide for dominant mode at 3 GHz having
(120p) Ω
377 Ω
226 Ω
629 Ω
Answer: Option
Explanation:

η = 226 Ω.

32.
The divergence of the electric field intensity at any point equals
1/4 pε0 times the volume charge density
l/ε0 times the volume charge density at that point
ε0 times the volume charge density at that point
the volume charge density at that point
Answer: Option
Explanation:

33.
For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the value of propagation constant P will be
15.9 radians/km
31.8 radians/km
63.6 radians/km
105.4 radians/km
Answer: Option
Explanation:

γ = a + jβ, a = 0 β = ωLC.

34.
The Depth of penetration of EM wave in medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be
6.25 cm
12.50 cm
50 cm
100 cm
Answer: Option
Explanation:

Skin depth

δ2 = δ1/2 .

35.
What is the characteristic impedance at 10 MHz?
547.7 Ω
54.7 Ω
5.47 Ω
.547 Ω
Answer: Option
Explanation:

, not depend upon frequency.

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