Chapter 12 Wave Propagation
| 1 | An antenna can be thought of as a(n) |
| | a. Oscillator |
| | b. Capacitor |
| | c. Transducer |
| | d. Frequency multiplexer |
| | |
| 2 | A wave that is characterized by having its direction of propagation perpendicular to its oscillation is known as |
| | a. Isotropic |
| | b. Transverse |
| | c. Polarized |
| | d. Refractive |
| | |
| 3 | Which is not an effect of our environment on wave propagation? |
| | a. Radiation |
| | b. Reflection |
| | c. Refraction |
| | d. Diffraction |
| | |
| 4 | A point in space that radiates electromagnetic energy equally in all directions is called |
| | a. Transverse |
| | b. Isotropic point source |
| | c. Omnisphere |
| | d. Shadow zone |
| | |
| 5 | The process of waves, which traveling in straight paths, bending around an obstacle is |
| | a. Radiation |
| | b. Reflection |
| | c. Refraction |
| | d. Diffraction |
| | |
| 6 | Which is not one of the basic modes of getting a radio wave from the transmitting to receiving antenna? |
| | a. Ground wave |
| | b. Shadow wave |
| | c. Space wave |
| | d. Satellite link |
| | e. Sky wave |
| | |
| 7 | The type of wave that is most affected by the D, E, and F layers of the ionosphere is: |
| | a. Ground wave |
| | b. Space wave |
| | c. Sky wave |
| | d. Satellite |
| | |
| 8 | The largest frequency that will be returned to earth when transmitted vertically under given ionospheric conditions is called the |
| | a. Critical frequency |
| | b. Maximum usable frequency (MUF) |
| | c. Optimum working frequency (OWF) |
| | d. Skip zone |
| | |
| 9 | The characteristic impedance of free space is |
| | a. Not known |
| | b. Infinite |
| | c. 50  |
| | d. 377 |
| | |
| 10 | The area between the point where the ground wave ends and first sky wave returns is called the |
| | a. Quiet zone |
| | b. Skip zone |
| | c. Null Zone |
| | d. All the above |
| | e. a and b |
| | |
| 11 | The refraction and reflection action of a skywave between the ionosphere and ground is known as |
| | a. Space diversity |
| | b. Skip |
| | c. Tropospheric scattering |
| | d. Fading |
| | |
| 12 | A satellite communication system used by companies such as K-Mart to quickly verify credit cards and check inventory data is called |
| | a. VSAT |
| | b. MSAT |
| | c. SATCOM |
| | d. WESTAR |
| | |
| 13 | A common type of radio wave interference is |
| | a. EMI |
| | b. Fading |
| | c. Reflections |
| | d. All the above |
| | |
| 14 | Diversity reception does not include: |
| | a. Space diversity |
| | b. Time diversity |
| | c. Frequency diversity |
| | d. Angle diversity |
| | |
| 15 | When installing a receiving antenna, you can often overcome diffraction problems by finding a |
| | a. Null zone |
| | b. Downlink |
| | c. Hot spot |
| | d. Skip zone |
Answers:
| C |
| B |
| A |
| B |
| D |
| B |
| C |
| A |
| D |
| E |
| B |
| A |
| D |
| B |
| C |
No comments:
Post a Comment