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Avionics Practice Test: Antennas and Wave Propagation
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Antennas are tools that send and receive electromagnetic waves. Wave propagation is the way these waves travel through space.

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Avionics Practice Test: Antennas and Wave Propagation
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25 Questions

1. The fields in the Fresnel zone are radio waves that contain the information transmitted.
2. What happens to the electric field between two conductors when the permeability of the material between the plates is increased?
3. An Em wave is said to be vertically polarized when the angle between the electrical field and earth is _______
4. Which of the following is the most necessary for an electric field to exist?
5. The type of dipole antenna that has a higher band width is called as?
6. All EM waves propagate at the speed of light irrespective of medium.
7. What is the impedance of the folded dipole antenna?
8. At what distance from the antenna does the far field start?
9. What is the ratio of the electric field strength of a radiated wave to the magnetic field strength called?
10. What is the power radiated by the antenna with gain called as?
11. Which of the following devices assist in using the same antenna for transmission and receiving?
12. Which of the following is not true?
13. A dipole antenna is also called as?
14. What happens when a vertical or horizontal polarized antenna receives a circular polarized wave?
15. What is the length of the shortest element in the yagi antenna?
16. What is the beam width for a half wave dipole antenna?
17. Parasitic element that is typically about 5 percent longer than the half-wave dipole-driven element is called _______
18. Which of the following is not true?
19. What happens when the radiation resistance of the antenna matches the characteristic impedance of the transmission line?
20. In a parasitic array antenna, the conductors that are not connected to the transmission line is called as?
21. What does the beam width of an antenna tell us?
22. Which of the following is not one of the types of driven array antenna?
23. Which of the following antennas produce a vertical radiation pattern?
24. The radiation from an open line can be increased by bending to which of the following angle?
25. The radiation pattern of a half-wave dipole has the shape of a ______

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