Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

In figure the voltage distribution on a vertical earthed antenna is represented by
A:
curve A
B:
curve B
C:
curve C
D:
curve D
Answer: B
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SHF range is
A:
30 - 300 MHz
B:
300 - 3000 MHz
C:
3000 - 30000 MHz
D:
30000 - 300000 MHz
Answer: C
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For free space propagation
A:
γ = a + jβ
B:
γ = jβ
C:
γ = a
D:
a = β = 0
Answer: A
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A person with a receiver is 5 km away from the transmitter. What is the distance that this person must move further to detect at 3 dB decrease in signal strength?
A:
942 m
B:
2070 m
C:
4978 m
D:
5320 m
Answer: B
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Electric lines of force do not cross each other because
A:
the lines of force mutually repel each other
B:
the lines of force emanate from a point charge
C:
the tangent to the line of force gives the direction of E and if they cross two tangents for E which is not possible
D:
none of the above
Answer: C
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