HAM HAM Radio Extra Class Test Radio Wave Propagation Questions and Answers 2

Question 1

What is the primary cause of auroral propagation on the VHF and UHF bands?

Accepted Answer

Charged particles from the sun interacting with Earth's magnetic field

Answer

Solar radiation ionizing the E layer

Answer

Temperature inversions in the troposphere

Answer

Reflection from meteor trails

Question 2

Which propagation mode is most responsible for long-distance communication on the 6-meter band during the summer months?

Accepted Answer

Sporadic E propagation

Answer

Tropospheric ducting

Answer

F2 layer refraction

Answer

Ground wave propagation

Question 3

What effect does the maximum usable frequency (MUF) have on HF propagation?

Accepted Answer

Signals above the MUF pass through the ionosphere into space

Answer

Signals above the MUF are absorbed by the D layer

Answer

Signals below the MUF cannot reach the ionosphere

Answer

Signals at the MUF experience maximum absorption

Question 4

What is transequatorial propagation (TEP)?

Accepted Answer

A mode where signals cross the geomagnetic equator via the F layer at VHF frequencies

Answer

Propagation along the equator using ground wave

Answer

Tropospheric ducting that occurs only in equatorial regions

Answer

E-layer skip between stations on the same side of the equator

Question 5

What is the approximate height of the F2 layer of the ionosphere?

Accepted Answer

250 to 500 km

Answer

50 to 90 km

Answer

90 to 150 km

Answer

150 to 250 km

Question 6

How does a geomagnetic storm typically affect HF propagation?

Accepted Answer

It causes a significant reduction or complete blackout of HF propagation

Answer

It enhances F2 layer propagation on all bands

Answer

It only affects frequencies below 3 MHz

Answer

It improves signal-to-noise ratios on the 20-meter band