Ham Radio General Class Test FREE Ham Radio General Class Test Radio Wave Propagation Questions and Answers 2

Question 1

What is the primary cause of ionospheric absorption of HF radio signals?

Accepted Answer

D-layer ionization during daylight hours

Answer

F2-layer recombination at night

Answer

Sporadic E-layer formation

Answer

Tropospheric ducting inversions

Question 2

Which propagation mode is most commonly used for VHF communications beyond line-of-sight during certain weather conditions?

Accepted Answer

Tropospheric ducting

Answer

Gray-line propagation

Answer

Meteor scatter

Answer

Near Vertical Incidence Skywave

Question 3

What does the term 'Maximum Usable Frequency' (MUF) refer to in HF propagation?

Accepted Answer

The highest frequency that will be refracted back to Earth by the ionosphere for a given path

Answer

The maximum power output allowed on a frequency

Answer

The highest frequency a transceiver can tune to

Answer

The frequency with the least amount of noise

Question 4

What effect does solar flux index (SFI) have on HF propagation?

Accepted Answer

Higher SFI generally improves HF propagation on higher frequency bands

Answer

Higher SFI reduces all HF propagation

Answer

SFI only affects VHF propagation

Answer

SFI has no measurable effect on radio propagation

Question 5

What is the approximate speed at which radio waves travel through free space?

Accepted Answer

300,000,000 meters per second

Answer

150,000,000 meters per second

Answer

300,000 meters per second

Answer

186,000 meters per second

Question 6

Which ionospheric layer is primarily responsible for long-distance HF communication at night?

Accepted Answer

F2 layer

Answer

D layer

Answer

E layer

Answer

Troposphere