# Extra Class Exam Question Pool

effective 7/01/2008 thru 6/30/2012

 Show: Unseen questions Weak questions Review questions Learned questions Incorrect answer choices

E3B: Transequatorial; long path; gray line; multi-path propagation

E3B01: What is transequatorial propagation?

Propagation between two points at approximately the same distance north and south of the magnetic equator

Propagation between any two points located on the magnetic equator

Propagation between two continents by way of ducts along the magnetic equator

Propagation between two stations at the same latitude

E3B02: What is the approximate maximum range for signals using transequatorial propagation?

5000 miles

1000 miles

2500 miles

7500 miles

E3B03: What is the best time of day for transequatorial propagation?

Afternoon or early evening

Morning

Noon

Late at night

E3B04: What type of propagation is probably occurring if an HF beam antenna must be pointed in a direction 180 degrees away from a station to receive the strongest signals?

Long-path

Transequatorial

Auroral

E3B05: Which amateur bands typically support long-path propagation?

160 to 10 meters

160 to 40 meters

30 to 10 meters

6 meters to 2 meters

E3B06: Which of the following amateur bands most frequently provides long-path propagation?

20 meters

80 meters

10 meters

6 meters

E3B07: Which of the following could account for hearing an echo on the received signal of a distant station?

Receipt of a signal by more than one path

High D layer absorption

Meteor scatter

Transmit frequency is higher than the MUF

E3B08: What type of propagation is probably occurring if radio signals travel along the terminator between daylight and darkness?

Gray-line

Transequatorial

Long-path

E3B09: At what time of day is gray-line propagation most prevalent?

At sunrise and sunset

When the sun is directly above the location of the transmitting station

When the sun is directly overhead at the middle of the communications path between the two stations

When the sun is directly above the location of the receiving station

E3B10: What is the cause of gray-line propagation?

At twilight, solar absorption drops greatly, while atmospheric ionization is not weakened enough to reduce the MUF

At midday, the sun, being directly overhead, superheats the ionosphere causing increased refraction of radio waves

At darkness, solar absorption drops greatly, while atmospheric ionization remains steady

At mid afternoon, the sun heats the ionosphere, increasing radio wave refraction and the MUF

E3B11: What communications are possible during gray-line propagation?

Contacts up to 8,000 to 10,000 miles on three or four HF bands

Contacts up to 2,000 miles only on the 10-meter band

Contacts up to 750 miles on the 6- and 2-meter bands

Contacts up to 12,000 to 15,000 miles on the 2 meter and 70 centimeter bands

 Color key: ● = Unseen ● = Weak ● = Review ● = Learned ● = Incorrect answer
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