Module 2_1 Quiz

1. Of the following frequency bands, which is most commonly used by the U.S. Navy?

a) ULF (Ultra Low Frequency)
b) VLF (Very Low Frequency)
c) LF (Low Frequency)
d) MF (Medium Frequency)
e) HF (High Frequency)

2. Why can the term "High Frequency" be confusing when referring to HF radiation (and therefore not usually used)?

a) It takes too long to write or say.
b) It makes the reader think it is used more often than it actually is.
c) It is actually a lower frequency band than what a majority of military and civilian electromagnetic systems use today.

3. Which of the following are advantages of using HF and lower frequencies compared to higher?

a) These signals can propagate longer distances than higher frequencies.
b) These signals are less affected by objects such as trees and buildings.
c) HF signals can sometimes travel in the sky wave mode.
d) a, b, and c are all advantages of using HF and lower frequencies for communications compared to other higher frequency bands.
e) None of the above are correct.

4. Which of the following are disadvantages of using HF and lower frequencies compared to higher frequencies for communications?

a) The transmitting antennas must be relatively large.
b) The amount of information that can be transmitted is less than for higher frequencies.
c) When using HF in skywave mode, there is no one signle specific frequency that will work all the time.
d) a, b, and c are all disadvantages of using HF and lower frequencies for communications compared to other higher frequency bands.
e) None of the above are correct.

5. What frequency band do commercial AM radio stations use?

a) ULF (Ultra Low Frequency)
b) VLF (Very Low Frequency)
c) LF (Low Frequency)
d) MF (Medium Frequency)
e) HF (High Frequency)