Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

If and

the time average Poynting vector is
A:
null vector
B:
C:
D:
Answer: A

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Beamwidth (between first nulls) will be for an antenna at 3 MHz with directivity of 100
A:
140°
B:
70°
C:
210°
D:
60°
Answer: A

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Which one of the following statement is not a correct for a plane wave with = 0.5e-0.1x cos (106t - 2x)az A/m?
A:
The wave frequency is 10-6 r.p.s.
B:
The wavelength is 3.14 m
C:
The wave travels + x direction
D:
Wave is polarized in the z direction.
Answer: D

P = E x H P = EH, θ = 90°

η = 120p = 377 Ω.

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For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the characteristic impedance will be
A:
14 Ω
B:
28 Ω
C:
39 Ω
D:
79 Ω
Answer: D

f = 400 kHz, L = 0.5 mH, C = 0.08 mF

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The length of half-wave antenna is at 30 MHz
A:
2.5 meter
B:
5 meter
C:
10 meter
D:
100 meter
Answer: B

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