Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

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
A:
15.9 radians/km
B:
31.8 radians/km
C:
63.6 radians/km
D:
105.4 radians/km
Answer: A

γ = a + jβ, a = 0 β = ωLC.

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The divergence of the electric field intensity at any point equals
A:
1/4 pε0 times the volume charge density
B:
l/ε0 times the volume charge density at that point
C:
ε0 times the volume charge density at that point
D:
the volume charge density at that point
Answer: B

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Calculate the wave impedance for TM mode in rectangular waveguide for dominant mode at 3 GHz having
A:
(120p) Ω
B:
377 Ω
C:
226 Ω
D:
629 Ω
Answer: C

η = 226 Ω.

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Which of the following should dominant wave have?
A:
Lowest cut off frequency
B:
Highest cut off frequency
C:
No attenuation
D:
No phase shift
Answer: A

Lowest cut off frequency or highest wave-length in a waveguide gives dominant modes.

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A short circuited stub is shunt connected to a transmission line as shown in the figure is, if z0 = 500 ohms, the admittance y seen at the function of the stub and the transmission line is
A:
(0.01 - j 0.02) mho
B:
(0.02 - j 0.01) mho
C:
(0.04 - j 0.02) mho
D:
(0.02 + j 0) mho
Answer: A

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