Exercise: Electromagnetic Field Theory

Questions for: Electromagnetic Field Theory

Which of following antenna produces elliptical polarisation?
A:
Helical
B:
Parabolic
C:
Dipole
D:
None
Answer: D
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For a wave propagating in air filled rectangular waveguide.
A:
guide wavelength is never less than free space wavelength.
B:
wave impedance is never less than the free space impedance
C:
TEM mode is possible if the dimension of the waveguide are properly chosen.
D:
propagation constant is a real quantity.
Answer: A
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The maximum effective aperture of a microwave antenna which has a directivity of 900, will be
A:
71.619 λ2
B:
716.19 λ2
C:
7161.9 λ2
D:
71619 λ2
Answer: A
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Which of the following statement is incorrect?
A:
Curl of vector potential is magnetic field density
B:
Electric charges in motion produce magnetic field
C:
Electric charges at rest produce electrostatic field
D:
None of the above
Answer: D
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The secondary lobes in binomial arrays can be reduced by
A:
maintaining spacing between two consecutive radiating sources less than λ/2
B:
maintaining the amplitudes in radiating sources, from outer towards the centre source, proportional to the coefficients of the successive terms of the binomial series
C:
both (a) and (b)
D:
none of the above
Answer: C
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