Page:Electronics Technician - Volume 7 - Antennas and Wave Propagation - NAVEDTRA 14092.pdf/111

 2-12. A transmitting antenna at ground level should be polarized in what manner to achieve best signal strength?
 * 1) Horizontally
 * 2) Vertically
 * 3) Circularly
 * 4) Linearly

2-13. What term describes the distance a wave travels during the period of one cycle?
 * 1) Wavelength
 * 2) Frequency
 * 3) Travel time
 * 4) Radiation rate

IN ANSWERING QUESTIONS 2-14 AND 2-15, REFER TO FIGURE 2-4 OF THE TEXT.

2-14. The points of high current and voltage are best described by which of the following terms?
 * 1) Peaks
 * 2) Crescents
 * 3) Loops
 * 4) Highs

2-15. The points of minimum voltage and minimum current are represented by which of the following terms?
 * 1) Lows
 * 2) Valleys
 * 3) Descents
 * 4) Nodes

2-16. An antenna at resonance will transmit at maximum efficiency; an antenna that is not at resonance will lose power in which of the following ways?
 * 1) Skin effect loss
 * 2) Heat loss
 * 3) Ground absorption
 * 4) Wave scattering

2-17. An antenna that radiates energy in all directions is said to have what type of radiation pattern?
 * 1) Isotropic
 * 2) Anisotropic
 * 3) Bysotropic
 * 4) Circumstropic

2-18. An antenna that radiates energy more strongly in one direction than another is said to have what type of radiation pattern?
 * 1) Isotropic
 * 2) Anisotropic
 * 3) Bysotropic
 * 4) Circumstropic

2-19. When viewing a radiation pattern graph, you can expect the areas of maximum and minimum radiation be identified by which of the following terms?
 * 1) High and low probes
 * 2) Maximum and minimum points
 * 3) Major and minor lobes
 * 4) Positive and negative lobes

2-20. If an antenna. is too short for the wavelength being used, what electrical compensation must be introduced for the antenna to achieve resonance?
 * 1) Lumped resistance
 * 2) Lumped capacitive reactance
 * 3) Lumped inductive reactance
 * 4) More power

2-21. If an antenna is too long for the wavelength being used, what electrical compensation must be introduced for the antenna to achieve resonance?
 * 1) Lumped resistance
 * 2) Lumped capacitive reactance
 * 3) Lumped inductive reactance
 * 4) Less power

2-22. A ground screen is a series of conductors buried 1 or 2 feet below the surface in a radial pattern and is usually of what length in comparison to the wavelength being used? 7
 * 1) One-quarter wavelength
 * 2) One-half wavelength
 * 3) Three-quarter wavelength
 * 4) Full wavelength