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# Kennedy: MCQ in Radiation and Propagation of Waves

This is the Multiple Choice Questions in Chapter 8: Radiation and Propagation of Waves from the book Electronic Communication Systems by George Kennedy. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

#### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. Indicate which one of the following terms applies to troposcatter propagation:

a. SIDs

c. Atmospheric storms

Solution:

2. VLF waves are used for some type of services because

a. of the low powers required

b. the transmitting antennas are of convenient size

c. they are very reliable

d. the penetrate the ionosphere easily

Solution:

3. Indicate which of the following frequencies cannot be used for reliable beyond-the-horizon terrestrial communications without repeaters:

a. 20 kHz

b. 15 MHz

c. 900 MHz

d. 12 GHz

Solution:

4. High-frequency waves are

a. absorbed by the F2 layer

b. reflected by the D layer

c. capable of use for long-distance communications on the moon

d. affected by the solar cycle

Solution:

5. Distances near the skip distance should be used for the sky-wave propagation

a. to avoid tilting

b. to prevent sky-wave and upper ray interference

c. to avoid the Faraday effect

d. so as nor to exceed the critical frequency

Solution:

6. A ship-to-ship communications system is plagued by fading. The best solution seems to be use of

a. a more directional antenna

c. frequency diversity

d. space diversity

Solution:

7. A range of microwave frequencies more easily passed by the atmosphere than are the others is called a

a. window

b. critical frequency

c. gyro frequency range

d. resonance in the atmosphere

Solution:

8. Frequencies in the UHF range normally propagate by means of

a. ground waves

b. sky waves

c. surface waves

d. space waves

Solution:

9. Tropospheric scatter is used with frequencies in the following range:

a. HF

b. VHF

c. UHF

d. VLF

Solution:

10. The ground wave eventually disappears, as one moves away from the transmitter, because of

a. interference from the sky wave

b. loss of line-of-sight conditions

c. maximum single-hop distance limitation

d. tilting

Solution:

11. In electromagnetic waves, polarization

a. is caused by reflection

b. is due to the transverse nature of the waves

c. results from the longitudinal nature of the waves

d. is always vertical in an isotropic medium

Solution:

12. As electromagnetic waves travel in free space, only one of the following can happen to them:

a. absorption

b. attenuation

c. refraction

d. reflection

Solution:

13. The absorption of radio waves by the atmosphere depends on

a. their frequency

b. their distance from the transmitter

c. the polarization of the waves

d. the polarization of the atmosphere

Solution:

14. Electromagnetic waves are refracted when they

a. pass into a medium of different dielectric constant

b. are polarized at right angles to the direction of propagation

c. encounter a perfectly conducting plane

d. pass through a small slot in a conducting plane

Solution:

15. Diffraction of electromagnetic waves

a. is caused by reflections from the ground

b. arises only with spherical wavefronts

c. will occur when the waves pass through a large slot

d. may occur around the edge of a sharp obstacle

Solution:

16. When microwave signals follow the curvature of the earth, this is known as

b. ducting

c. tropospheric scatter

d. ionospheric reflection

Solution:

17. Helical antennas are often used for satellite tracking at VHF because of

a. troposcatter

b. superrefraction

c. ionospheric refract

Solution:

### Complete List of MCQ in Electronic Communication Systems by Kennedy

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