Antenna & Wave Propagation
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Antenna & Wave Propagation
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25 Questions

1. In which kind of waveform is the phase velocity defined?
2. In solution evaluation process of inhomogeneous vector potential wave equation, if points are completely removed from the source, then by which factor does the time varying field & static solution differ?
3. In retarded potentials, what factor of time delay is generally introduced in A & V equations?
4. What is the direction of varying orientation of polarized surface wave at the earth surface in a wave tilt mechanism?
5. On which factors of earth does the magnitude of tilt angle depend in surface wave? A. Permittivity B. Conductivity C. Resistivity D. Reflectivity
6. Which among the following is/are not present in free space?
7. In an electrically large loop, an overall length of the loop is equal to ______
8. What kind of beamwidth is/are produced by Chebyshev arrays for given side lobe level (SLL)?
9. Under which conditions of charge does the radiation occur through wire antenna?
10. Sterdian is a measurement unit of __________
11. What is the far-field position of an electric short dipole?
12. In broadside array, all the elements in the array should have similar _______excitation along with similar amplitude excitation for maximum radiation.
13. According to Snell’s law in optics, if a ray travels from dense media to rarer media, what would be its direction w.r.t the normal?
14. What is the nature of radiation pattern of an isotropic antenna?
15. For avoiding ground losses, better is the surface conductivity, less is the __________
16. The knowledge of which parameter is sufficient for deriving the time varying electromagnetic field?
17. Under which conditions of two unit vectors, the polarization loss factor (PLF) is equal to unity?
18. Which pattern is generated due to plotting of square of amplitude of an electric field?
19. A dipole carries r.m.s. current of about 300A across the radiation resistance 2 Ω. What would be the power radiated by an antenna?
20. If the path difference of two waves with single source traveling by different paths to arrive at the same point, is λ/2, what would be the phase difference between them?
21. According to Secant law, which frequency is greater than critical frequency by a factor of secθi?
22. Which type of ground wave travels over the earth surface by acquiring direct path through air from transmitting to receiving antennas?
23. F2 layer of appleton region acts as a significant reflecting medium for _____ frequency radio waves
24. What is/are the major applications of an infinitesimal dipole that contribute/s to its analysis?
25. The concept of magnetic vector potential finds its major application in deriving expression of magnetic field intensity especially for ______