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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 6
26.
The secondary lobes in binomial arrays can be reduced by
maintaining spacing between two consecutive radiating sources less than λ/2
maintaining the amplitudes in radiating sources, from outer towards the centre source, proportional to the coefficients of the successive terms of the binomial series
both (a) and (b)
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Which of the following statement is incorrect?
Curl of vector potential is magnetic field density
Electric charges in motion produce magnetic field
Electric charges at rest produce electrostatic field
None of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
The maximum effective aperture of a microwave antenna which has a directivity of 900, will be
71.619 λ2
716.19 λ2
7161.9 λ2
71619 λ2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
For a wave propagating in air filled rectangular waveguide.
guide wavelength is never less than free space wavelength.
wave impedance is never less than the free space impedance
TEM mode is possible if the dimension of the waveguide are properly chosen.
propagation constant is a real quantity.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Which of following antenna produces elliptical polarisation?
Helical
Parabolic
Dipole
None
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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