Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

∇ . = 0 is frequently known as
A:
continuity equation for steady currents
B:
Laplace equation
C:
Poisson's equation
D:
none of the above
Answer: A

Equation of continuity

∇ x J = 0.

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The refractive index of E layer at frequency of 81 N
A:
0
B:
∞
C:
1
D:
0.5
Answer: A

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In a line VSWR of a load is 6 dB. The reflection coefficient will be
A:
0.033
B:
0.33
C:
0.66
D:
3.3
Answer: C

VSWR = 100.6

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If the height of transmitting and receiving antenna in a LOS system are 49 meter and a 9 meter respectively then the distance up to which communication may be possible is about
A:
40 km
B:
110 km
C:
400 km
D:
1100 km
Answer: A

Distance = 0.4 [ht + hr] metre.

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The input impedance of short-circuited line of length l where l < λ/4
A:
inductive
B:
capacitive
C:
resistive
D:
none of the above
Answer: A

l < λ/4, ZL = 0

, if Zd comes +j kZC then inductive,

If Zd comes -j kZC then capacitive.

For 0 ≤ l ≤ 1/4, λ ≤ l ≤ 3λ/4 will be inductive.

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