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Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

    Unseen questions
    Weak questions
    Review questions
    Learned questions
    Incorrect answer choices  

2016-E3C: Radio-path horizon; less common propagation modes; propagation prediction techniques and modeling; space weather parameters and amateur radio

2016-E3C01: What does the term ray tracing describe in regard to radio communications?

Modeling a radio wave's path through the ionosphere

The process in which an electronic display presents a pattern

Determining the radiation pattern from an array of antennas

Evaluating high voltage sources for X-Rays

2016-E3C02: What is indicated by a rising A or K index?

Increasing disruption of the geomagnetic field

Decreasing disruption of the geomagnetic field

Higher levels of solar UV radiation

An increase in the critical frequency

2016-E3C03: Which of the following signal paths is most likely to experience high levels of absorption when the A index or K index is elevated?

Polar paths

Transequatorial propagation



2016-E3C04: What does the value of Bz (B sub Z) represent?

Direction and strength of the interplanetary magnetic field

Geomagnetic field stability

Critical frequency for vertical transmissions

Duration of long-delayed echoes

2016-E3C05: What orientation of Bz (B sub z) increases the likelihood that incoming particles from the Sun will cause disturbed conditions?





2016-E3C06: By how much does the VHF/UHF radio horizon distance exceed the geometric horizon?

By approximately 15 percent of the distance

By approximately twice the distance

By approximately 50 percent of the distance

By approximately four times the distance

2016-E3C07: Which of the following descriptors indicates the greatest solar flare intensity?

Class X

Class A

Class B

Class M

2016-E3C08: What does the space weather term G5 mean?

An extreme geomagnetic storm

Very low solar activity

Moderate solar wind

Waning sunspot numbers

2016-E3C09: How does the intensity of an X3 flare compare to that of an X2 flare?

Twice as great

10 percent greater

50 percent greater

Four times as great

2016-E3C10: What does the 304A solar parameter measure?

UV emissions at 304 angstroms, correlated to solar flux index

The ratio of X-Ray flux to radio flux, correlated to sunspot number

The solar wind velocity at 304 degrees from the solar equator, correlated to solar activity

The solar emission at 304 GHz, correlated to X-Ray flare levels

2016-E3C11: What does VOACAP software model?

HF propagation

AC voltage and impedance

VHF radio propagation

AC current and impedance

2016-E3C12: How does the maximum distance of ground-wave propagation change when the signal frequency is increased?

It decreases

It stays the same

It increases

It peaks at roughly 14 MHz

2016-E3C13: What type of polarization is best for ground-wave propagation?





2016-E3C14: Why does the radio-path horizon distance exceed the geometric horizon?

Downward bending due to density variations in the atmosphere

E-region skip

D-region skip

Downward bending due to aurora refraction

2016-E3C15: What might a sudden rise in radio background noise indicate?

A solar flare has occurred

A meteor ping

Increased transequatorial propagation likely

Long-path propagation is occurring

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Previous group:
2016-E3B: Transequatorial propagation; long path; gray-line; multi-path; ordinary and extraordinary waves; chordal hop, sporadic E mechanisms
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Extra Class Exam Question Pool
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2016-E4A: Test equipment: analog and digital instruments; spectrum and network analyzers, antenna analyzers; oscilloscopes; RF measurements; computer aided measurements
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