Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

Distilled water at 25°C is characterized by σ = 1.7 x 10-4 mho/m and ε = 78 ε0 at a frequency of 3 GHz. Its loss tangent is (ε = 10-9/36p F/m)
A:
1.3 x 10-5
B:
1.3 x 10-3
C:
1.7 x 10-4/78
D:
1.7 x l0-4/78ε0
Answer: A

Loss tangent .

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A transmission line having 50 Ω impedance is terminated in a load of (40 + j 30) Ω. The VSWR is
A:
j 0.033
B:
0.8.+ j 0.6
C:
1
D:
2
Answer: D

ZC = 50 Ω, ZL = 40 + J30, r

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The sinusoidally time varying vector field
is
A:
elliptically polarized
B:
circularly polarized
C:
linearly polarized
D:
unpolarized
Answer: D

60° phase, same magnitude, it form.

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The refractive index of E layer, if angle of incidence is 30°
A:
0.5
B:
0.25
C:
0
D:
1
Answer: A

μ = sin i

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Find cut off wavelength for mode TE11 in a circular waveguide having radius 2 cm. Assume K'a = 1.841
A:
4 cm
B:
6.82 cm
C:
8 cm
D:
68.2 cm
Answer: B

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