Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

Gain of an antenna with a circular aperture of diameter 4 meter at frequency of 10 GHz, with directivity 60
A:
60
B:
100
C:
30
D:
90
Answer: A

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A dipole antenna of λ/8 length has an equivalent total loss resistance of 1.5 Ω. The efficiency of the antenna is
A:
0.89159%
B:
8.9159%
C:
89.159%
D:
891.59%
Answer: C

Rr = 80p2 , Re = 1.5 Ω,

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The I/P impedance of a short circuited quarter wave long transmission line is
A:
purely reactive
B:
purely resistive
C:
depend on the characteristic impedance of the line
D:
none of the above
Answer: D

Because for irrotational, ∇ x = 0.

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For a transmission line with homogeneous dielectric the capacitance per unit length is 'c', the relative permittivity of the dielectric is 'εr' and velocity of light in free space is 'v' the characteristic impedance z0 is equal to
A:
B:
C:
D:
Answer: C

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Calculate the wave number in waveguide having dimensions 4 x 2 cm at 3 GHz
A:
6.28
B:
62.8
C:
8
D:
0
Answer: B

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